I am a grown Adult, but childish things make me very happy.

Here's my take on the types of the various Dragon Ball Z characters.

Goku - ENFP IEE

Gohan - ISFP SEI

Future Gohan - ISTJ LSI

Goten - INFP IEI

Vegeta - INTJ LII

Kid Trunks - ESTP SLE

Future Trunks - ISTJ LSI

Piccolo - INTP ILI

Kami - INFJ EII

Frieza - ISTJ LSI

Cell - ESFJ ESE

MajinBuu - ISFP SEI

Yamcha - ISFJ ESI

Tien - ISTP SLI

Krillin - ENTP ILE

Nappa - ESTJ LSE

King Kai - ISTP SLI

Chi-Chi - ENFJ EIE

Bulma - ESFP SEE