Here is a list I came up with. I do not doubt I'll think of more. Add your own here.
Ichigo: You guys think my hair could use more highlights?
Rukia: Your right Ichigo, I bow to your superior wisdom!
Matsumoto: I really need to invest in more turtle necks now that winter is coming.
Ikkaku: More saki you say? No thanks I think I am way over my limit.
Zaraki: HEY Yumichika... get in here and help me put the bells in my hair!
Kira Izuru: OK guys... I'll take the lead, everyone stay behind me.
Toushirou: It's about my bedtime... anyone seen my teddy bear?
Renji: Yeah... I just know I'm gonna regret putting that tat there someday.
Iba: (See Ikkaku above)
Kon: I totally respect you for you're mind!
Chad: (Pretty much anything that involved more than 5 consecutive words)
Mayuri: No seriously.. it doesn't hurt at all!
Keigo : Come on you guys… you know I’m the most grounded practical person here.
Orihime: You know you guys won’t make it without me.
Karin Kurosaki: Maybe something in pink? With lots of lace?
Urahara: I agree. it’s time to ditch this ratty old hat. (Alternatively) Are you kidding?! Yoruichi is a total hag!
Ururu: Jinta… you are SO dead now!
Ulquiorra: You know that overwhelming urge you can get to just laugh so hard your side aches and milk squirts out your nose? Yeah… well I feel a moment like that coming on.
Yamamoto: You know.. I feel like going club hopping.
Gin: Why do they always snap the pic when I’m in the middle of blinking?
Byakuya: I don’t get it… what do you mean by pink isn’t my color?
Shunsui: I think your right…there are way to many women at this bar.
Toushirou: I don’t know what you mean… I think Matsumoto’s outfit is fine. (Alternatively) Of course you can call me Shiro.
Anyone in the 11th Division: Darn it.. I hate when I get blood on this thing!
Now come on... think of you Bleach Character and think of something you just can't see them saying.

It's fun! Really!