I'm currently roleplaying a merc, and Im wondering if there are any quests other than Three Card Bounty, that would be suitable for a character like this. Also no mod since I'm on PS3.

Maybe Come Fly With Me? I mean, if you do it the non-MQ-related way where it's a favor/job rather than for information on the Khans.

Eh, I usually do that quest later and tell manny to screw off. I don't really think a bounty hunter would do a job just for information.