Goten

Son Goten is one of the main secondary heroes of Hangout Ball. He is regarded by his friends and family as a prodigy, having turned Super Saiyan at a young age, and learning the Super Saiyan God and Super Saiyan Blue forms at the age of 13. He even managed to reach Super Saiyan 4 and combine it with godly ki in a short time span and reach his own transformation that surpassed both Beerus and Ultra Instinct.

Biography
For his biography in the official canon, see this page

Techniques and Special Abilities
See this page for the techniques that canon Goten has.

Super Saiyan 4
Goten achieved this form in the Hyperbolic Time Chamber. It far surpasses the previous 3 Super Saiyan forms and is around the same level as Super Saiyan God.

Super Saiyan Blue 4
This is achieved by combining Super Saiyan 4 with god ki. The power of this form is noted by Vegeta to be above that of even Super Saiyan Blue Evolution 3. Goten has never used this form in actual combat, so how much stamina it drains is not known. However, this form is still inferior to Mastered Ultra Instinct.

Super Saiyan Sullen
This form was achieved by Goten pre-revival when he found out that Goku's sacrifice against Nightmare was for nothing. In this state, he looks similar to Super Saiyan Blue, but with green hair and eyebrows. The power of this form surpasses even Beerus, as the latter was easily defeated by Mechaknight while Goten recovered from multiple blows by Mechaknight, and overall did significantly better against him. Goku later stated that Goten's power surpassed his and Vegeta's in this state.

Battles

 * Goten (Super Saiyan God/Super Saiyan God Kaio-ken/Super Saiyan Blue) vs. Goku (Super Saiyan 4/Super Saiyan 4 Kaio-ken)