It says Super Saiyan in his name, so this isn't really a guess.

Just because two hybrids fuse, doesn’t mean they are genetically more Saiyan. A 2-liter pitcher is not filled to the brim by two half-full 1-liter bottles.

This one is a little more speculative in nature because while the fusion involves one Son Family member, this Fighter might be considered by the Dragon Ball series as too different from Goten Prime for his family tree to be factored in.

For the same reason as Son Family.

This Fighter comes from the Majin Buu Saga when the two boys are visited by Super Buu in the Hyperbolic Time Chamber. The fusion looks like a child and is composed of two fused children, so it seems pretty obvious.

Fusion

Gotenks is not the only fusion in the series, and he definitely won’t be all we see in DBL (I'm looking at you, Gogeta). This means there will probably be a Tag associated with these types Fighters.

This is the Tag associated with all Piccolos fused with Nail or Kami. This isn’t exactly the same as Fusion Dance Fusions, so this Tag is a very big guess and Gotenks would only be tagged in this way if he wasn’t Tagged explicitly as a Fusion.

This one kinda hinges on Fusion being added to the game's roster of Tags, since Merging Fighters like SP Kami Piccolo BLU are not Tagged as Kami.

For the same reason as Trunks.