CE suggestion for Herc support?

Definitely bond, it's the reason Herc is seen as one of the best SRs.

If I were to choose, Herc with starting NP. Check your friends if they have finished Part 1. If many haven't, might as well put his bond CE.

2030 Heracles

Either his bond for survivability or something that boost his damage like golden sumo, limited zero or brave hero eli

Bond ce is on almost all hercs, and it's good for prolonged fights, but speaking on my own behalf, I prefer when they have 30-50% starting ce bonds like Sumo, Halloween princess and holy night supper, because I have merlin and waver. But yeah, bond works too. K scope is meh. would never use.

I would say bond CE as that is rarer than anything else. Anyone looking for a friend support is highly likely to have multiple Herc choices, with multiple CE choices, but from my list, there aren't that many with the bond CE. It's really up to the situation with each player as what is generally "best" at any time.

EDIT: just counted and 5/18 Hercs on my friends list have bond CEs (out of 49 total friends)