The meme potential of a girl with a camera and a smiling face is good enough reason to have her (now that we have multiple secretaries), but she's also not half bad as a combat unit. She gets a shield, and having the shield gives her FP buffs, while losing the shield means she's getting EVA buffs. The uptime is quite good, so she's not a bad side DPS (she has a 69% damage buff at 2 stacks and 119.7% at three stacks) that can sub-in for off-tanking and can even work as a main tank (44% eva at two stacks and 72.8% at 3). The problem is the optimal timing can be a little iffy, but she's alright for AFK fighting since it'll generally be good enough, just not fully optimized. The tradeoff between her and SR-3MP is just uptime vs power.

As expected of the main girl I guess.

Oh, and her tiles are weirdly shaped, but this is not uncommon for off-tank dolls anyway.

Yes, Pekola, as opposed to a certain dumb rabbit. The eternally-starving once-most-powerful angel. She actually won't attack at all until you meet her conditions of getting enough buffs. Thankfully, stuff like Python's FP buff stacks count as individual buffs. More hilariously, the fairy talent Fervor also counts as three buffs. This makes satisfying the conditions for her skill actually pretty easy.

What you get for doing so is a ridiculous RF that completely ignores enemy armor and shields. A major downside to this though is she wont deal as much damage as another RF if you don't need such capabilities, since she isn't affected by very many damage buffs due to how she works.

This should be obvious, but you should pick up her unique gear if you plan on using her.

The beef-loving cowgirl from a very weird show. She has a shield, but it takes way too long to pop up before it's useful in most cases, as it only pops up with her reload cycle. On the other hand, it's a huge shield, but in many cases you're better off with other shield SGs. She's not the worst SG though I guess, so run her if you don't have anything better.