She has very weird mechanics. I want to say something witty but that's really how it works. The most immediately noticeable thing is that her damage is actually cut in half and she fires twice. This seems odd but no, its not just a visual thing either, and both shots actually can end up on different targets. The first shot uses normal RF targeting, while the other has real time targeting to always shoot the farthest target. Vs heavily armoured (enough that AP rounds wont go all the way through) or high HP enemies, this can be bad. Or it can be excellent at trash clear.

Also note that because she shoots twice, it only takes half as many firing cycles as it says on the skill to get stacks, as she gets 2 stacks per cycle (1 per shot). It also has interactions with Sei and Jill that are in the detailed page.

Yes I know that's not really her name. And yes, you'd think the unit whose hands are actual guns would be a handgun, but nope, she's an SMG. MICAAAAAAAA.

She has a pretty interesting skill that reminds some of C-MS. What it is is mildly more complicated, because it comes with good AND bad sides, and allows her to be both a main tank and an off tank. As an off tank, she provides decent firepower with 100% uptime, a debuff no one cares about (-acc) and a really nice buff (constant eva up!) for the main tank, while as a main tank she has permanent Eva up, buffs acc of the same column ("vertical row") but actually makes the off tanks (or just people in the same column) a little less survivable. Skill discussed in more detail in her entry, but its fun stuff.

A problem she has though is the shape of the tiles. That lacking middle row really gets in the way, but she has enough other uses that this isn't too awful if you know what you're doing (For example, you want to buff the everloving bajeezus out of your main tank's dodge instead).

Also she buffs Rifles with her tiles too too, but this doesn't seem to come up all that much.