Ah, Kerria/Yamabuki! I suppose I'll go first.

She is one of the core characters on my roster as well as my second-most favorite girl after my waifu. I got her on 4/23 via the Spring '18 ticket.

Statistics
HP and attack are core stats for HP absorption skill users like Kerria. 20,472 max HP* is above average (albeit lower than Red Ginger's) and should give her enough reservoir that can be supplemented by Healing Boost as her skill leeches so much HP. 8,112 max ATK* is the best among those with HP absorb, only slightly bested by that of Abutilon, Sakura, and Ume (all 3 of which have purely single-target skills). 2,648 max DEF* is on the low end, but it doesn't matter much if she can evade and simply regain 2x the HP she lost with a swing of her deadly katana. She is rather slow at 430 SPD, but her usefulness should outweigh it anyway especially in broken dungeons where speed is the least of one's worries.

Grade: A+


Skill
Kerria and Red Ginger are the game's only native rainbows with HP absorption, and neither of them offers a vantage point, being equal in this regard (standard x4.3 multiplier with HP absorption, 36% proc at skill level 5). In-battle HP regeneration is few and far between, so those that can considerably heal themselves have some edge over many others.

Grade: S


Abilities
When Kerria got her bloomed abilities last year, people were going bananas. With her powerful "survival kit," she can single-handedly bring victory even in really difficult battles.

Granted that she doesn't have party-wide buffs, she has stronger versions of them, and she benefits from it most. A 40% attack buff to augment her high base attack stat translates nicely into a marked damage output, further boosted by damage of up to 62.5% of her current health (when overhealed by Healing Boost's effect), powering her DPS as well as HP absorption to even more ridiculous levels. Combined with her evasion, her enemies are set up for a rude awakening in a vicious cycle of leech-evade-leech-evade until they die. My Kerria in a -70% [work in progress] debuff lineup makes a mockery of Level 245 raid bosses, regenerating more HP than the damage she receives, and the enemies die trying!




Kerria is the last woman standing in the Core Stage battle

Kerria's +40% defense buff and 6.8% damage reduction, which are surprisingly higher than those of Saffron's (+30% and 5.3% respectively), conveniently covers her "weak point." If push comes to shove, she also can resist fainting with guts (although from my experience in EX Sakura and Ume, it was not proccing all the time).

Grade: OP...... I mean, S


Team Building
Kerria strongly hinges on her skill not just for damage but also for survival, which makes it imperative that she is coupled with skill activation support so that she can keep swinging it as much as possible. That said, she can be a carry of sorts in a debuff-activation hybrid, or to a lesser degree, in a crit-activation hybrid and watch her damage skyrocket.


Conclusion
Kerria is the singular most powerful girl in the game, having solid core stats + game-breaking repertoire that made her into the most formidable one-woman army as we know it.

With that, I give her the D...... er, S+.


Extra
Back in my days on the other version, I befriended a non-forumer with Kerria as his assistant, and as I was regularly using his helper lineup, Kerria slowly grew on me, becoming my second most-favorite knight after my waifu. I eventually realized that Moneti designed both of them, so it's a big check. I really love her second portrait the most (mmm, armpit); forget the bloomed one. While she does check a lot of boxes, her voice isn't doing justice for her beauty though. Nevertheless, she still makes for a great waifu.

Grade: A+