Sorry to bother, but i feel like i'm missing something. In the core box i've a booklet with the fluff for the 8 char, where Can i find more aouta the aristos and the world of aristeia!? In the expansion there's not a booklet :(... Am i missing something?
On the website you can pull up each Aristo from a menu to see their cards... it also has a bit of extra fluff as well. But not as comprehensive as the book does sadly.
Lunah and Mr. Deadpool also have Infinity writeups, you can find them here: https://human-sphere.com/index.php?title=Mercenaries