DSR-Precision DSR-50 – ★★★★★ Rifle
AKA… I'm sure you can come up with a few backronyms for DSR, given her artwork.
She's a big bamboo with decent stats (higher firepower than M99, lower than NTW-20), but a variable multiplier on her skill damage. 6x against unarmoured enemies is extremely unattractive – Mosin with her chip manages the same damage output, with much lower cooldown –, but 10x against armoured enemies is very attractive on paper, since a lot of bosses you want to smack with bamboos are armoured.
…except, of course, MICA does it weirdly: DSR's skill doesn't look at the armour stat, but at a separate, hidden "has armour" tag that some armoured enemies do not have set.
With bamboos being rather niche to begin with (they're never mandatory to clear something), this does not exactly help making her more versatile. If you know how (and where) to use her, have fun.