Having a "5.5 anniversary" seems a little arbitrary to me, but it's always nice to get new character art! As with some previous outfit sets, they are going with an animal theme. Darj seems to be evoking the White Rabbit from Alice in Wonderland. (The heart-shaped teacup is a nice touch.) I'm not quite sure what Anchovy is representing; the tail is horse-like and there seems to be a tiny unicorn horn, but the position of the ears is more sheep-like than horse-like. Carpaccio is dressed as a big cat, a lion I guess from the tail; lion ears are usually more round than pointy but they seem close enough. Maho seems to be a Golden Eagle or similar bird. Kay's hoodie looks like an American Bison. Nishi's kimono seems to be patterned after the Red-crowned Crane.

I really want to get that character card of Darj. Her outfit really accentuates her legs; she looks so hot in it!

There is a mission in the game where you can check out the girls' skills by fighting against them (as AI opponents) with your own tanks. Strangely, this Anchovy card has an ability that gives a bonus but also leaves her vehicle immobilized for at least a few turns. So every time I do the mission, her tank is just sitting off in a corner of the map the whole time! I had to look up what exactly was the purpose of the ability; it seems to give a stat buff to other units of the same side when they are sitting on one of the tiles adjacent to Anchovy's tank. The game AI usually tends to send its tanks to fire at your units as quickly as possible, so it doesn't make use of her ability at all!