Name: Mystery Path

Gender: Male, straight, pony

Age/DOB: also immortal like the others, unknown dob

Origin: Equestriaverse, unknown location; Currently Black Maresa, San Palomino Desert

Family: Unknown, very possibly has foals with Equestria versions of Rhea, Mel, and possibly Caroline...

Other: He is normally not seen as an Alicorn, as he 'loses' the horn and wings but keeps the magic they bestow; few have seen him with them

Height: as Earth Pony 10hh, as Alicorn 16hh at shoulder

Weight: though not particularly slender or muscular in build, he's got 'walking legs' according to some, wait why are you watching his tail?

Hair: mane and tail are salt and pepper, a streak of lighter grey over very dark graphite, usually mane is kept quite short but as an Alicorn it grows a bit fluffier as does his tail

Eyes: brilliant turquoise green, with a reflective pupil, eerie, with slighlty baggy eyelids and harsh judgey brows

Appearance: pale tan colored fur, though as an Earth type this is a little more mottled with yellowish dappling; Earth version has solid yellowish hooves while the Alicorn has split darker ones; He has no actual 'cutie mark', but people do swear it's a briefcase - it's painted on if you see it

Otherwise all you need to know is that this is still Keenan, Gman, or whoever he's going by these days, and is also a pony...

Image Credits: generalzoi mlp maker

 
Physical Abilities: He is sturdy and does walk a lot, his hoofsteps can be heard usually late late at night around the facility and often enough right behind a closed door or sealed window. He is not tremendously strong but for some reason he seems almost entirely impervious to any physical damage. While Alicorn magic might create a shield, those are usually temporary and somewhat visible around the person. Also if struck by anything, he ... almost seems to 'clang' but he is definitely not metal! He doesn't seem to take any damage from other sources either, like heat or radiation, and never seems out of sorts in storms though he does carry an umbrella... Does not sleep, at least no pony has ever caught him napping. His home does have beds, and they even occasionally seem used, but whether he is in one doing the sleeping? Probably not
Magic Abilities: Mystery Path is definitely a mystery all right. Is he merely an Earth Pony? What about the elusive moments he's clearly got a horn and wings? Is he a Changeling? or some otherworldly monster hiding in plain sight?
-- Shapeshifting? while this might not actually be accurate, he seems to have two distinct forms and depending on whether you're somepony he trusts (very rare) or somepony he wants to impose his will on (more likely) he can 'become' an Alicorn, tall and somewhat more stately, and also a bit scary. Those who he does trust with this knowledge figure that he's not actually shapeshifting, but is instead just disguised magically as an Earth pony to protect his true form.
-- Teleportation, while some Unicorns can manage this feat, he has taken it to a high art. He can appear basically anywhere there is just enough room to balance on, and more over: he wants you to see him there, if even only for a moment while you're fleeing from the things in the lab
-- Telepathy, Dream Command, Hypnotic Suggestion, and Empathy, while he's not that great with actually empathising with anypony, he can definitely tell their mood, and communicates over great distances (across the entirety of the continent, if not farther) when needed, mind-to-mind. When close up, he can hold ponies in a bit of a thrall, a hypnotically induced stun, or just while somepony is vulnerable (asleep or injured) he can insert fake memories, suggest courses of action to follow, or induce emotions that will remain with them for a while after waking or recovering. He does tend to come to ponies in their dreams, or at least while they're asleep in some way, leaving cryptic messages for them or 'informing' them of their new duties
-- Time Command, while this power is clearly his to use, he only uses it in very dramatic moments, to pause a nearby area around himself and somepony else, usually only one pony, and while they're frozen like this, they can breathe and look around but can't move or speak. Usually this ends with him putting them in a physical stasis tube...
-- Telekinesis, though he doesn't use this power often, he can still lift... well basically anything, though he does so only while in Alicorn form so he isn't wasting magical energy on other things at the time. He's been known to have lifted entire laboratory structures, or reassemble them from rubble when things go wrong in said lab. This clearly exhausts him, so he will only do it either alone, or with the help of those he expressly trusts to be there
-- The Spooky Voice, when he really is putting on The Show for investors or instructing new employees, or just trying to scare his friends, Mystery Path can invoke a really weird inflection in his voice, sometimes echoing, sometimes appearning behind your ears or from everywhere at once, maybe not even coming out of his moving muzzle. He may put emphasis on the wrong syllable of a word, or draw it out far too long for comfort, or extend those s sounds into a hiss. All of this is for show, he can speak perfectly normally when he wants to
Skills or Profession: Bureaucrat, businessman, investor, troublemaker. While he claims to have 'employers', he's never stated who they are, he's more of a broker of duties for other ponies to perform. However he does wholly own Black Maresa and perhaps about half of Apasture Science, perhaps other companies as well. What he is good at is messing with ponies and goading them into doing ... questionable things. Nothing too terrible - at least so far. He seems very capable of navigating any complicated facility or city street easily, and even just blending in normally with other ponies such as at a theater or in a mall. He knows military jargon and banking terms alike, and has a strong sway at board meetings to get investors on board with whatever nonsense is being done at these facilities of his. When you sign a contract with him, you really should read the fine print. No, read it again.
Personality: compared to other (human) versions of himself, Mystery Path is a bit of a wild card, but one whose intentions are not wholly evil. He likes a little bit of chaos, maybe he took up a challenge from Discord, maybe he exists because of Discord. (He scoffs at that notion.) He loves setting up the dominoes of events very carefully, only to delight in watching them fall, and don't you dare interrupt either of those phases! He's that kind of pony. While it might seem he's unapproachable, if he likes a pony he'll definitely confide in them or befriend them, and not in the utterly ruinous method that Discord uses. Ponies have value, and he usually intends to keep that value high

Events or History: It's a mystery. No, really just it's a mystery, he might not even be a pony, really. Discord doesn't say, but then Discord might not know either, and would lie about it anyway. Suffice to say that the high-tech and high-magic research facilities of Black Maresa and Apasture Science are definitely his to meddle with as much as he pleases. They hire anypony with the guts to work there, and he has plenty of investors from big banks and rich families from Manehattan to Los Pegasus looking on with greedy little eyes...

How did he find - or be found by - a dragon? Well, that's their own story and they're not talking.

Dragon

Name: Grisseth
Gender: Undefined, flexible, what do you need?
Size/Shoulder/Length: Variable, currently about 5'4" at shoulder, but may grow larger with time and the carefully maintained supply of patina-covered metals available
Colors: Patina Teal, body a rich dark grey-green slightly mottled and reflective, with mane, tail, and wings that are brilliantly teal-green, metallic mottling easily visible; white horns
Features: Glider Goat, four legs with three-taloned feet, four wings with single large finger, goat/horse like head with mop of mane and two very large upward curved horns, high rump, and large tail with plentiful tuft fur; All Glider Goats have an affinity for the metal that's in their colour name. They love it, they covet it and they will go to great lengths to acquire it. The more they consume their metal, the bigger they get. It is the only way in which they can grow.
Powers: Telekinesis (for Flight), given the bulk and strength of the body of this dragon, they likely need this power to lift off. This is nothing new in Equestria, most of their Dragons have such an ability too. Grisseth's is quite strong, though their flight isn't fast they can lift very heavy weight in addition to themselves
Teleportation, with line of sight or a known location, Grisseth is right there whenever you need them
Telempathy, will you do this for them? Yes of course you will. Their mental voice is not 'smooth', it's more like running your paw pads over roughened metal just like that patina on a statue or a metal panel, and if you extend your claw to scrape it, that's exactly what happens when you disobey
Shapeshifting, generally Grisseth presents themselves as above, but can adopt a more localized 'small sized dragon' appearance, or even a bat-winged pony to keep up the theme here in Equestria. They can become male, female, something in between, humanoid, even duplicate ponies or creatures for a time
Illusion Magic, everything is fine here, don't mind the smell of burning rubber and the occasional spark, just move along... this power is helpful when something goes sideways while investors are around, they can produce a visual and minor sonic illusion that is convincing enough if it's in a small area such as a single lab or large vehicle. They can make smaller and much more detailed illusions with concentration, such as 'the results of that experiment you wanted to succeed so much at oh look at it it's amazing now sign here for that investment...'
Smoke/Shadow Magic, while this is often used to remove the smoke and shadows, Grisseth is best at creating them. Dramatic entrance? You got it, room does dark and the fog machine starts up. At least, that's what everypony believes happened! But when they're really working at it, they can create forms and terrors that reach out, and may, thanks to their other abilities, actually do some damage
Dark Magic, not just shadow, but a grim and slightly evil power that may be of use when controlling things that Should Not have been summoned in the lab. While it can kill small things, it can prove quite painful for larger ones such as any pony sized or above, and they can manipulate this power to be a blast, a whip, bindings, or other such tangible effects, as well as just a pervading 'sense of gloom' in an area
Unique Ability: Touch of Decay (invoke at will), now look, if you put a fresh made piece of metal in front of Grisseth, they will absolutely touch a little bit of it to test to see if it'd become patinaed over time. And if it can, just leave it, because that's theirs now. This can work on other substances if needed, but metals are best. Even little tiny bits of metal will do, so that nice metallic flake paint job your new vehicle got? it's flaked off and peeling. Even things like chrome coating will rust with their touch
Parentage: unrelated to others
Origin: unreleased, Lantessama, by Trix for Aututmn 2024
Other Info: Mysterious, Fragile and Broken but Wise because of it; Grisseth has seen some things in their time, and been kicked around a bit too. They won't talk of it, no details will come, but let's just say that Grisseth and Mystery Path have a lot in common
Species Info: Glider Goats are a darker type of dragon. They're not known to stage grand plots of evil dominion. They are more the subtle seductors, the tempting teasers and the quiet voices that call out from the shadows. They keep their plans and machinations secret, some even from their bonds, and will only reveal them when they've been brought to completion.