First Order Officer for quicker cooldowns, tmr and instant turn meter as well as buffs, he doesnt hit very hard but he is extremely useful, Kylo Ren for turn meter boost as well as a heavy hitter, hits fast and is tanky, FOST is another great tank that helps protecting your very fragile FOO, last but not least you need another heavy hitter, and that is either FOTP or FOE, i would say they are about equally strong but they each benefit a different situation, FOTP might work in some battles FOE wouldnt be able to win and vice versa.