LogFAQs > #964316923

Yeah, Lima and Tsumugi are fantastic units in PvP, but outside of that they are both pretty niche and while can have uses in certain bosses are better things to focus on at first. Tsumugi is a great disrupt unit, but rarely much need for that in PvE.

Of course, eventually you'll have them all grinded out even as a f2p - I've got every unit from the main shops maxed out now, save for when they put new ones in at least.

Otherwise Cal's advice all looks pretty good to me.