Mima's characters were kind of hard.
He would call the Auditor a walking ink blot and tell him to get back to pencil pushing.
He would ask Koishi to read his subconscious.
He would call GlaDOs a low-grade AI that even a potato could power.
He would make fun of the fact that Salvador "roided out", and tell him that because of that, his d*ck shrank and fell off.
He would call Pontius a fat@$$ in shining armor.
He would ask Mima if she has a lower half. (Dirty joke.)
Kokoro is a hard one, but he would probably make fun of the fact that she lost her mask of hope. He would probably call her a hopeless walking masquerade.
He would make a bunch of cracks about Sekibanki "losing her head", and other puns like that.
He would call Sam "Serious" Stone a copycat/ripoff/cheap, watered down imitation of himself.
He would be making various remarks about Lonestar and would say stuff like, "Howdy ya'll." Basically, derogatory steriotypes about cowboys/Texas.
He would call Voltar a brain in a jar. (It's hard to come up with anything for him.)
He would tell Vinnie & Spike to go back to the zoo. (Another hard one.)
Kristia is next...
@Kristia
I already did some of your characters, as well as others.
(Click Me)