I've been focusing on the party members that I really want to use (the main duo, Jade, Edna, Elize, Yuri, etc.), but I'm still running a bit low at the moment. Also, I keep on getting non-banner-related Mirrages. I actually rolled a Yuri recently. I would switch my avatar over to that one, but I leveled my Edna mirrage up (and I like Edna), so I'll let it be.
By the way, isn't it strange that a big crossover game would promote using single-game setups in your parties? Anima's weird, though I like how some apply across worlds (was it Yuri and Repede who share an Anima with the Eternia characters?).