Board Thread:Questions and Answers/@comment-104.162.145.101-20150214050925/@comment-26040524-20150214221714

based on my own playing experience and some reading analyses of these units:

most important:

Shera (an elite damage blocker, necessary for hard, drawn-out fights)

Kuda (adds a lot of buff enhancements to other teammates' attacks)

next in line:

Vanberk (very nice base stats, adds critical hit buff too, very interesting leader skill at 6*)

Twins (older unit, but anima type still makes yours viable; if you don't have any other characters that negate status ailments, their leader skill is very helpful.)

Kajah (not a versatile unit, but a pure homerun hitter in base attack power.  If you need a someone in an OTK squad, he can hold his own for sure)

long term projects:

Tiara (only if you have no other healer)

Belfura (she actually has great base stats, but it's hard to figure out what kind of team she would fit in with the best...  If you need a solid hitter for a monowater team, then move her up in importance)