Kimahri because he's calm, quiet and loyal..and a big furry softie inside.
Lulu because she's cool and I like her style.
Auron because he's badass, strong but kind, has a nice voice and is hot..and old enough to not make me wonder whether to kiss him or change his diapers (see Tidus comments below).
I couldn't stand to have Tidus around because his sulleness and sulks made me want to turn him over my knee too many times. Rikku is just too dayum perky, and Wakka needs to buy a clue and engage his brain fully before he opens his mouth.