Hm, considering how two Nutaku games has gotten English-exclusive characters now, it looks like they DO want to hear what original (as in, not DMM) content we'd like to see in Aigis, even if it would be harder to implement unit here compared to cards in other games...
With that in mind, my dreams are:
1. Loli units. Every badass needs one (or ten). I would really like to see them treated as they should, H-scenes and all, but if they implement them as their own kind, gaining bonus stats from items separate from gifts (as females should) or alcohol - les'say from Toys - with conversations at affection milestones, I'd be okay'ish with that.
2. Monstergirls. Kemonomimi are cool, but actual hybrids would be way too awesome to miss. And on a (un)related tangent, furries. Not my cup of tea, but such creatures have their own fanbase and could draw in new players. (But I'd reeeally rather see MWA stay consistent in art department).

Both would open way to an exclusive (or even backported! XD) events, telling their little stories. I really like the implications of current Ada event's story, and would love to see racial relationships in the wake of monster invasion explored more, to which monstergirls lend themselves quite readily. And lolis - well, they are so awesome you could tell any story you want with them, from cutesy and romantic to serious and dramatic, so yeah :P

It would also be interesting to see more interplay between our haremettes, as hard it would be to account for everybody's diverse lineups. Hm, Bashira, completion silver and drill gold units are sure to be in everybody's collection, so there's that path, and rarer ones can be drops from the event, with event maps being framed as sort of their recollection on how they met with prince...

Generally, I'd like to see more lore, so more dialogues between the maps, and more conversations with our waifus slash comrades would be nice to see. At least, can you please see to implement a window with unit's brief bio at their detail screen. Maybe even expanding, dependent on unit's affection level...


ЗЫ. For event types, being new player I most liked the farm ones, as they are only ones underpowered player had a chance to get his hands on an event heroine)