Main Characters:

Sonic

"OH GOD WHY?" what he usually says when something awful happens

Butt-Monkey: He's usually involved in some of the more "abusive" jokes towards a character

Pinkie Pie

"Howdy, sweetie!"

Cloud Cuckoo Lander: Even more so than her official counterpart.
Adaptational Dumbass: In MLP, Pinkie was kinda loopy but she still had moments of intelligence (especially in the movie!) But here, she's in the words HP 5: "hella stupid"
Cuddle Bug
Genki Girl: Up to eleven
No Sense of Personal Space

Mittens

A black and white cat who is also a chef

Darren

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]]The smug owner of the titular house, he is very self centred and gets mad very easily.

Anti-Hero
The Bully He's to quote the book "an asshole"
- Bully Brutality He pummels Samantha to the floor during an argument about something seemingly unknown
Sadist He outright says to Screwy "your pain makes me laugh" skip to book 5 and he tells the previously mentioned Samantha "your pain turns me on"
Brutal Honesty
Hair-Trigger Temper
Sir Swears Alot Sometimes mispronounces "fuck" as "feck"
Wangst Dwells on things like not being able to abuse Flint

Yellowfang

A talking Persian cat who can do black magicAttention Whore Loves acting like an idiot for

Bluestar

Minor Characters Who Don't Show Up As Often

Nyan Cat

Ambigious Gender is male, but apparently sounds like "a gay chipmunk fused with a teenage girl"

Samantha

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One of Sonic's old friends, the best friend of Flint

Butt-Monkey To the Nth degree
Embarrassing Nickname Due to having a high-pitched voice, is nicknamed "Squealy Dan" by you guessed it, Darren!
Motor Mouth when mad
Naïve Animal Lover
Shrinking Violet
The Woobie Is described as "wimpering like a puppy" after being beaten to a pulp by Darren.