Okay, so I have expanded my thoughts on the ideas from before:
The pegasus girl is named Skye. She says she came to look for her boyfriend, but is actually looking for her father.
The dog is named Jack, and the zebra (no longer a doe) is named Morgan. They are at odds because the former's daughter was once in a relationship with the latter, but it ended because she had to move away for college. They will each ask the player to help them best the other (possibly by any means necessary). One such method is by music, or, more specifically, mind-influencing songs. (Part of me wonders if we're allowed to reference actual songs in the game, as I have a good song in mind for this.)
Jack is a yellow canine with black eyes, wearing dress pants and a shirt featuring a cartoon character similar in appearance to him. He runs a thrift shop where one can buy old games, clothes, busted equipment, and stuff like that. He likes to tinker and is a generally friendly fellow, so you could possibly bring him items to look at to increase his trust in you.
Morgan is a female zebra with a mohawk, and she wears a zebra-skin jacket that barely covers her breasts (similar to this, but completely zebra skin instead of part leather
https://img1.etsystatic.com/000/0/5476463/il_fullxfull.203956399.jpg), a black t-shirt under that, and skin-tight pants that reach the middle of her shin. She runs a Hot Topic, full of accessories - earrings, hats, belts, lanyards, wallets, headphones - music, clothing based off TV shows, some that is not, and other trendy items. She can be stubborn, but she does her best despite being nineteen years old. She will be wary if the player is both a horsemorph and male, as she prefers the company of females, having once been a guy.
Please tell me what you think, and if anything should be improved! ^^