Who's Baba?
Now let's see....
Samus Aran - You have to be pretty good to virtualy wipe out and entire species....
Samus Aran looking person - Don't know enough yet to tell...
Jango - He was killed so not him...
Boba - He's still alive but we don't see much of him so I can't really tell...
Spike/Jet/Faye - Did they ever catch a bounty head and get the bounty? Ever?
I have to say Samus as of actual ability... Though I think Jango and Boba have a more "cool" factor.