O-Yoroi's fine, overall not as hard hitting as others but she's cheap, has stealth from Martial Arts, works well enough with the pilot who is almost a skirmisher with FO and the contender. Pairs really well with Yuriko.
Bikes are fine too, kind of a pricy glass cannon but they really do a lot, especially in early or late games. Asuka's a neat Lt option too (backed up with a Kempeitei). Overall I like them but I've had a bad taste with them because My Hacker Aragoto has repeatedly failed at least 3 WIP rolls in a row to get objectives.
Oh all sorts of Dumb but you do you and all the power to you.
Well I just painted this Odalisque if that's the kind of stuff you want to see.
The official forum borders between mostly dead and decently active. There's currently an online campaign with players (that affects the official fluff) called Strikezone Wotan, Phase 1 had a lot of activity but it mellowed out by Phase 2.
There are a couple of farmer's bureau groups that are respectively active, some of them post Poland-ball type memes if that's what you're into. The occasional fan-art and weird OC comes out, like the OP right now or what Robot-Jones draws, it's just not that many people.
Overall the main problem is that this isn't a popular game, even if it's quite popular for being a Table-top wargame being behind 40k/AoS, and WM/H. Other games are even slower in content like Malifaux. Keep in mind there isn't that many people into these games.
As for actual fluff, I guess part of its problem is the soft paywall. Rules are free and you can buy the models for the looks, but actual fluff is behind the rule books you physically buy, along with some articles, and what's included in the RPG. There isn't a Black Library like that other game, instead just one """"Manga"""" they released rather recently, nor is there an extensive fluff wiki beyond what some group compiled for Unit Fluff descriptions and pictures in human-sphere.com