Cameos you'd like to see in future Senran Kagura games?

So it's finally happened! Senran Kagura's actual games are now being visited by characters from other franchises - DOA and Ikkitousen in particular. This now means that all kinds of crazy things have been opened up to us as possibilities for future cameo characters. In this thread, I think it'd be fun to share what characters we'd like to see from what series.

Rather than a "rule," I'd say I'd like to challenge you guys to do one of three things - for each series you pick, either choose a full team (five characters), a three girl team (like the Ikkitousen precedent), or just one representative for that franchise (like Ayane from DOA). It might be easier to just go for the full team, but maybe you only want a couple characters or maybe you want to be a little creative in how you pick characters. Assuming characters can only be added in groups of five or so, maybe you want to pick five series to have single representatives or one series to have three and two to have one. The sky's the limit!

Or just go wild and list dozens of characters you want to see. Have fun with it! I'll post some of my own hopes after I think on it for a bit.