Underlord Hades

At least the Hera should be easy (although Hera is always the easier half of the greco-roman Ult evos)

EDIT: Well I now look stupid since it doesn't involve Hera...

Anything could happen. Maybe they decide to make Hades a different color attribute. Then they could use those colored Heras or Zeuses. Or it could be like that the materials are dark descend monsters like Satan, Beelzebub, or Hera.

Same. I want to go D/D for Ronia but I like the dual resist of D/L. Will probably go D/D since I don't want binds.

Technically, he keeps his level. However, since feeding him the materials also counts towards leveling him up, you'll probably end up getting him at least one level up. Also important to note is that monsters keep the same number of awoken skills upon ultimate evolution.

Nope you don't have to max him, when the monsters next evolution is ultimate you just evo them through power up fusion hope this helps.

Thanks so much for that info I've got almost everything I need for the D/L ultimate evo but I wasn't sure if I need to get him to max. Oh, does he also keep his level when he ult evo's?

I tried doing that and it didn't work