Somewhat old thread, but didn't want to make a new one...
KRU is pretty good (lead is amazing)but it feels like he is missing something to fit as a FO toon. He does well on passing around advantage and crit damage, but no TM gain. Also, FO synergy has never really relied on debuffs to win (like empire), so tenacity up seems weak. I think something like this should be added:
On basic omega: if target already has tenacity down, all FO allies gain 5% TM
On unique zeta: gain advantage for 2 turns after countering (or regain advantage if he already had it, similar to Phasma lead).
Basic just makes him fit more into the FO TM gain concept and buff his basic a bit since tenacity down isn't really that useful for FO. 5% is a random number, but didn't seem extremely overpowered and is certainly a smaller buff than CLS.
Unique is because KRU gives advantage to an ally who doesn't have it every time he's damaged, but that means he usually gives it to himself, and then immidiately wastes it on his 5-7k damage basic. Which is fine and all, except then he never has advantage for his big hit special, which is when he really needs it (without getting it from Officer)
Just my thoughts.