Hoyo games in specific have a very strong pity system, which means that with a bit of planning you can reliably get the characters you want. There's other problem that the live service model brings, but the gacha's really not a huge issue if you have a bit of self-control
Before we declare this the start of a love triangle, it should be remembered that it's barely a romance at all so far. This could kick that off, but I think it's more likely that the new girl is going to provide an alternate viewpoint on blending in with humanity
It's not... unheard of. Liz is definitely more commonly paired with Nerissa, and GG x CC is the main Justice ship, but this is the second most popular in both categories
Gigi's persona is a goofy idiot, which includes saying that she initially wanted her class to be listed as 'fister'(1), instead of the 'chaser' like it ended up being
It's not super clear, but the game is insistent that the dolls are remotely controlled. Given the nature of the game, it's a fair bet that there's a flesh and blood Herta around somewhere we'll eventually be able to roll for