I got lucky and got both Clarisse and Melissabelle in twenty rolls flat so here we are to talk about one of the cutest unit we got in quite a long while.
She's an extremely powerful unit as far as I've tested her so far (and I didn't get her EMP yet) and finally allows a dark staff team to be pretty competitive. All her skills and even the ougi have extra effects if executed after turn 10, but thankfully her third skill accelerate time to make that happen earlier as you can see from this video.
1) First skill that packs Veil, Mirror Image, Shield (after "turn 10") and Armored (after "turn 10") in one skill. (awesome for stamina builds)
2) Second skill 30% boost to charge bars for all allies, CA Damage (After "turn 10"), CA Damage Cap (After "turn 10") and Damage cap (After "turn 10")
3) Third skill that does plain damage (one or two times depending on the turn) based on the number of turns passed (as you can see from the video it's not affected by the health of the boss)
Her passive also increase all party ATK based on the numbers of turns passed.
We still don't have precise numbers (I'll test more later), but the initial impression is "pretty impressive".