I'm still doing my replay (although I'm finally nearing the end) but I caught something in the dialogue I wanted to ask about regarding who the big bad ultimately is.
When they interrogate Felicity / Ferocitease in the garage she mentions her job was to sneak aboard Artemesia while Riley and the MC were fighting Lovestruck. She elaborates that she turned into a cat because they knew Arty's cameras would have a hard time picking up a small animal below her bumper and above her trunk.
The only way to get that information would be from Shiro or his designs. Even if someone managed to somehow examine her cameras without drawing attention to themselves while doing it (unlikely) it's not like they'd be able to see their field of view.
I know Shiro is a threat as far as Arty's existence is concerned, as well as the MC's wizard grandpa, but what's the prevailing theory about his involvement in the abduction? When he showed up at the academy he genuinely seemed to not know where she was. Can we assume his daughter (if she even is his daughter and not a terminator) is actually the one behind it all? She'd be able to program all the killer robots in the "rescue force" too.
That's been the going theory for a while now, I think. Not sure if anyone discussed it before but I first floated it a few weeks ago, I think.
She's got the best combination of motive, means, and opportunity.
I suspect Shiro is oblivious to her activities. He's allowed his obsession with revenge to consume so much of his life he became blind to what his daughter was becoming. I assume it started out as her trying to be part of the quest for revenge. But somewhere along the way she started wanting power. Maybe she convinced herself that if SHE had the same power as Unbreakable, she would never allow Criminals like Hardlight to run free, killing people.
Maybe she also thought having that sort of power would get daddy's attention at long last. In one fell swoop, she could avenge her mother, earn her father's gratitude, punish Queen Unbreakable for failing to deal with Super Criminals "the right way", and then have the power to "change things for the better" all to herself.
She did what all the best villains do: Convinced herself she was the good guy.