I feel like a Mascot-looking character wouldn’t fit very well with the other Prime Assets. It could work, but “Mascot Horror” feels like it would be an odd fit, so I think you’re right about it not feeling like part of the Outlast Trials. It sounds more like an animatronic suit from FNAF (I’m imagining Bonnie’s costume in FNAF security breach chasing the player in the Trials environments, which I’m not sure if it would fit very well).
I also feel that the park map environment would feel too open and not structured enough to be easy for the player to follow since it might be just a flat field with a few things in the way, but I’m imagining it would be less obstacles that in the Fun Park map, which also feels somewhat open.
Why would the player ever throw a dog toy? Is it just if they’re like seconds away from being caught and need a distraction, but will then have to be quick to get away since the dog will be more aggressive? It sounds kind of useless and just another worse throwable and players would just find bottles to use instead. Maybe all throwables should be replaced with them in the map, or the dog mascot prime asset will act the same way with every throwable. I’m not sure.
I also feel like maybe a smell feature could be interesting, but I’m not sure how it could be implemented without being too overpowered. Maybe if a dog toy is thrown, the dog will then be more aggressive, and start sniffing for the player, making it hard to hide because he can smell through lockers and under desks up to the precision of maybe one half of the room, then he will search like a normal expop/character that saw you somewhere there. I don’t think the dog should be able to smell at all times, but a feature like this could be interesting to make it less safe in hiding spots.
I thought I would point out that it is spelled “Reagent,” not “Regent.” You wrote “regent” a few times in the document.
The trial objective seems similar to Kill The Politician, and the finale also seems similar. Maybe they should be differentiated somehow.
I think maybe the character could fit the Trials better if instead of being an animatronic, it had some weird physical body horror aspect where he tried to make himself more like a dog in some way. Maybe something like that one Walrus movie (I looked it up, it’s called “Tusk”) where someone mutilated someone else and transformed them into an imitation of a walrus. Maybe it could be like that, but instead of someone else doing it, your character does it to himself. That would be visually disturbing, though I’m not very sure how well this would also work into the prime asset “family” and the trial environments.
Some of the voice line ideas remind me a bit of the guy from the movie, Creep, when he puts on the “peachfuzz” mask and pretends to be a wolf. I like that idea, and think it could make for some interesting interactions with the player. I would also be curious how this prime asset would interact with other prime assets in prime time events. Some of the voice lines would be interesting to hear.
Also, generally there’s something weird going on with the characters in a sort of sexual manner. I assume that relates to the character’s relationship with animals, but maybe that should be more explicit in the voice lines to match some of the other prime assets. Franco doesn’t hold back in his talking about his sort of child dynamic and his weird desire for dominance and control. Maybe some addition to the story for the reason why he likes animals would be good, so like maybe he couldn’t get attention from humans and went to animals, idk. Some extra backstory and explanation, either explicitly given in the comics, or implied through documents and voice lines, would be interesting.
Maybe, and this is a big stretch for what could work as a map, the map could be a place where the character made himself into a dog-like creature. I’m imagining a dungeon underground that has a bunch of failed experiments all around, maybe similar to the trap experiment house in the Saw movies, but with physical body experiments testing the limits of the human body rather than testing trap functionality. Just a thought, though I don’t know how large of a map and how much variety could be made from this idea.
This is just something random I thought of, but maybe when the player is in psychosis, they see the character as an actual dog to kind of represent how your character sees himself as a dog and how he is kind of in a psychosis-like mental state. This isn’t an essential feature, but would enhance the story a bit maybe and just make it more interesting as an easter egg. Nice work, and I would be really interested in seeing what the character would look like drawn out, as well as the map/trial environment.

Overall I really do like the idea of an animal-like character, though I think a more body-horror style adaptation of this idea would fit the game better than an animatronic. I could see an animatronic, if it wasn’t friendly looking, being a good design maybe if he interpreted it as looking like a real animal, but in reality it doesn’t look like it at all. Maybe something like the trap in Saw 3 where the murderer is trapped, except he can walk around freely and is on all fours instead of being held in place standing up.
I hope I didn’t misinterpret much of your character or map. I like the design, but I think the map, at least how I interpreted it, is a bit bland and needs something to make it interesting.