Kairi Yes and yes! What you see is pretty much what you get. Usually thinking about Riku&Sora and her other friends. She's also a Princess of Heart soooo no Darkness - she's not actually capable of dark/bad thoughts or emotions. And she won't notice.

Hiroki lol go ahead, he'll just yell ineffectually. He's always thinking about either missing/worrying about/fantasizing about his boyfriend or books/his research, probably both. He won't notice.

Alice Yes and yes, but she'll know what's up and if she doesn't want to have a conversation or is trying to hide something she has a lot of practice confusing and blocking out psychics. She'll just start translating poetry into several languages or something. Normally, though, what you'll pick up is split between her surface thoughts about Jasper and the rest of her family, friends, fashion, etc. and the part of her mind that is constantly experiencing flashes of the future, both immediate events and more distant possibilities. She tracks specific people a lot of the time, so there's that. At camp it's all people she's close to or suspicious people she's been warned about. Oh, and underneath all of this is a constant blood-lust because lol vampire. But it's well controlled.