Ok, first things first: TURN OFF HER AUTOSKILL AND SET HER TO MANUAL IMMEDIATELY.

Also, NEVER SET HER ON A FRIEND ECHELON EVER.

UPDATE: This is fixed everywhere now so you can ignore that bit.

That out of the way, she's a pretty decent SMG with your choice of permanent passive buff. She renders most of the long-duration-but-average-buff Evade type SMGs completely pointless, having more HP than most, and basically infinite duration buffs you can choose.

Your choice of permanent 65% Evade buff (default), 85% Firepower Buff (2nd choice) or 200% Acc buff (3rd choice). Using her skill cycles between all 3 of them (if you cant tell, they're color coded. Evade is blue, FP is red, hit is orange. If you're colorblind... sucks to be you I guess.) Noone actually uses the Acc buff though. Also if you leave her autoskill on, it constantly cycles between these 3 and it gets annoying. In a friend echelon, you cant turn it off ever so it forever spams it and annoys people.

Oh, and she can load AP ammo, if you for some reason need an SMG that can do that. This does come up sometimes.

Honestly, she's not bad, but there's just...nicer SMGs now.

Another grenadier that's not useless. Her grenade fires after just 4 seconds, making it actually matter, and either makes hit enemies take 115% damage for 3 seconds (3 or more hits) or buff her own damage by 60% for 8 seconds.

The self buff isn't too useful, giving her damage output on the lower end of usable at least, but since she hits a wide area she'll probably trigger the much more useful debuff. While much better dolls have largely obviated the need for this, maybe it'll be useful for someone. I dunno.

She does well at corpsedragging in some night maps but I don't know if anyone even does those anymore, doubly so since the main benefits {extreme low cost and mats for upgrading equipment} are no longer as relevant as they once were.

The original Wonder Nine, she has... absolutely nothing in common with any of the other wonder nines in the game, instead opting to have a Tactical Throwing Ax which is more useful than her other gun. Basically, she's a bamboo spear unit in handgun form. Surprisingly good damage for such low base ATK if teamed with the right support squad. Seems niche, but she can actually 1-shot some bosses if setup properly.