"do you mean getting their powers or becoming them in the series?"
either way i would become kid buu,hulk,superman,Vegeta,Neo or Wolverine.
kid buu:
+ almost invincible,immortal,super strength and you can enter your own body in a mini you model like thingy.
- You have to be Pink.
Hulk:
+ extremly tough,very strong and pissed off all the time:]
- you have to be green and dumb as hell.
Superman:
+ exray vision,super hearing,super breath,eye laser,indistructble (cant spell that word

),super strength,ability to fly and can be under water and in space.
- if you are in the series kryptonite exists and that would be a downfall otherwise a flawless character to be,exept that he isnt immortal but ages alot lesser then humans.
Vegeta:
+ Super strength,ability to use powerful energi attacks which makes nuclear bombs look like fire crackers,ability to fly,tough like hell and faster then the speed of light and you are a prince.
- your forehead is bigger then jay leno's chin,isnt immortal but ages alot slower then humans.
Neo:
+ ability to fly,can change things with just his thoughts like stopping bullets,strong,faster then human ever could become.
- isnt immortal,not even bullet proof and if you are him in the series you have to die:]
Wolverine:
+ you can use most of your powers without making a big scene and getting your face known over the entire planet,you can smell like a animal,animal sense,claws which comes out of your hands (and if its after when he got the admantium metal in his body you can never break a bone),have the ability to heal and recreate cells and ages alot slower then humans.
- isnt immortal,cant fly,isnt super strong if you get into the water youl be as a rock trying to swim with all that metall in you.
some of the people/heroes/figures powers i would want to have.