This game is same as Pokemon Hangman in the Pokemon section.
You can ask the question and the answer would be hinted in _ _ _ _ and so on.
Upto 3 Hints.
You can add Characters,Moves and anyother suitable thing.
So I start it.
Guess the Character:
Helper of Kami and Dende.
Wears White Turban on Head.
Knows the technique of Power sense.

Piccolo.
G_H_N

Sorry Victin but its not Piccolo.
Its Mr Popo.
Your Character is Gohan.

_AN_MB_

Villian powerful enough to defeat both Goku and Vegeta.
Weak to Noise.
Defeated by Gogeta.

Janemba.
S_P_R B_ _

I under estimated your Dragon Ball Knowledge.
Your move is Spirit Bomb.

_TA_ D_S_ BR_A_E_

Move used to kill Janemba.

WRONG.
Mine was Super Buu.
Anyways, stardust breaker.

MY _ _ I C G_ _ AN

Sorry.
About your hangman.
Give atleast one hint.

Actually I am using Google and searching random names and answering all yours by google

I got it but atleast tell if your hangman is character or a move.

It is Mystic Gohan

Well,I asked for the hint but you told the answer.
Now my turn:
The first Ultra SuperSayian.
One of the Frieza's previous men.
Extremely Wishing of Immortality.

Well,I asked for the hint but you told the answer.
Now my turn:

_E_E_A
The first Ultra SuperSayian.

He is a shy and studious intellectual child. As a child, he lacks the Saiyan fighting spirit. He must utilize his incredible half-breed Saiyan potential and emotional reserves to protect those he loves, becoming one of the most powerful Z Fighters. As an adult, he achieves his dream career of becoming a great scholar.

Its simply Gohan.If you had just written Scholar,I would have guessed that.
And you didn't answered mine one.

Its Vegeta!