Fusion/Merging

Goku + Vegeta = Gogeta
Vegeta + Goku  = Vegeta
Goten + Trunks = Gotenks
Piccolo + Krillen = Pillen
Dende + Goku = Denku
Mr. Satan + Goku = Mr. Saku
Piccolo + Kame = Kamicolo
Nail + Piccolo = Nailcolo

                                                                  
Absorbing

Buu + Gotenks = Super Buu
Buu + Great Kaioh = Fat Buu
Artificial 17 + Android 17 = Super 17
Kibito + Shin = Kaioshin
Cell + #17 = Cell's second form
Cell + #18 = Cell's third form               
This is not quite a fusion but when you think about it is a type of fusion.
To explain it: Fusion means, a merging of diverse, distinct, or separate elements into a unified whole. In other words two different objects that come together are fused.


                                                                    
Control

Bibidi----Buu
Babidi----Buu
Babidi----Majin
Bebi------Goten
Bebi------Gohan