Fun fact GBF also has Amira since Cygames likes to reuse their characters, so GBF has loads of RoB characters like Lucifer, Azazel, Forte, Jeanne, Rosetta is Rose Queen, etc. GBF has the whole Bahamut thing and angels and demons, etc. They don't have any direct connection to RoB, but some characters keep some story beats and powers. Likewise RoB has some GBF characters. They're similar enough to the point that some people like to speculate GBF is like a rewritten version of RoB or some kind of AU.

GBF Amira seems to have the same backstory as Amira (just, GBF setting, not RoB). Eustace has never canonly interacted with her and I usually play those kinds of things as "Might have seen/heard of them but otherwise probably wouldn't know" which ALAS THIS WOULD HAVE BEEN REALLY FUN LOL

Still, this would be super interesting! even if I don't know much about RoB aside from the indirect connection to GBF lmao