Gokin

Gokin is the son of Pan and Trunks who appears in Dragonball NG. He is the brother of Trurunnks.

Android #26 Saga
Gokin first appears in this saga along with his brother Trurunnks who were born in 797 age. Both him and his brother were taught how to become Super Saiyans by Gohan, Goten and Trunks He trained with his brother many times and won in all their battles apart from 3. Eventually, Goku teaches both of them how to transform into Super Saiyan 3s.

Cabbadu Saga
Gokin, Trurunnks and Goku went on a search for the Dragonballs seeing how they hadn't been used in a while. On the way they battled a dark demon who Gokin and Trurunnks fought as Super Saiyan 3s. After Goku beat the Saiyan Cabbadu, Gokin and Trurunnks were taught the fusion and became Gokunnks.

Ultimate Dragon Saga
In the battle against Infinite Shenron, Gokin in the form of Gokuunks atempted to fight the Dragon but was stopped by his mother who knew that they'd both be killed since not even Goku, Vegeta, Gohan, Goten and Trunks' Super Saiyan 4 forms weren't powerful enough.

Demon beast Saga
Gokin and Trurunnks fused to become Gokuunks and went to Super Saiyan 3 along with Pan and Goku to try and defeat Kabbinasha, however, they couldn't win.

Xiccon Saga
Gokin didn't do anything important during the fight with Xiccon. Years later he and his brother, now teenagers competed in the world tournament. He died sometime during the years before 896 Age.

Majin Burnyu Saga
Gokin, Trurunnks, Gohan, Trunks and Goten were teleported to earth to help the Z fighters fight Majin Burnyu.

Demon lord Saga
Gokin appeared in otherworld along with the other Z fighters who told Goukiu where to find Gohan.

Super Saiyan
Gokin was taught how to transform by Gohan, Goten and Trunks. He only used it in battles with his brother.

Super Saiyan 3
Gokin was taught how to become one by Goku. He used this in battles with his brother as well as against the Dark demon and Kabbinasha.

Super Saiyan 4
Gokin learnt this form while training in otherworld.

Super Saiyan 5
Gokin learnt to become a super saiyan 5 while in otherworld.

Super Saiyan 6
Gokin became a super saiyan 6 when in otherworld. He was teleported to earth to use this form to battle Majin Burnyu.

Gokuunks (Fusion)
Gokin was taught the fusion by Goku. He fused with Trurunnks to become Gokuunks. He fought against Kabbinasha using this form but lost. He can transform into a Super Saiyan and Super Saiyan 3. After training in Otherworld he learnt how to become a Super Saiyan 4, Super Saiyan 5 and Super Saiyan 6.