Temple of Ranma's Sailor Senshi Seifuku

To clarify, what I'm asking is how many series would you use more than once or twice, beyond bit parts. To simplify, the series in question would likely be what you really like (and thus would want to use if possible/applicable) and what you're really familiar with. This question is posed to the fan-fic authors that exist, as well as hypothetically to those who don't.

My main three would be/is Ranma 1/2, Sailor Moon and Aa! Megami-sama. Others I would/will use often enough are Tenchi Muyo, To Love-Ru, Shugo Chara and Touhou. Only seven for me. But they're both what I'm familiar enough with and easy to use or crossover with.

(That's what I came up with after looking over the stories I've started, finished, and the one-hundred and twelve story ideas that may or may not be the next top model. Or something like that.)

I only write Ranma crossovers. The prologue of my Ranma/One Piece crossover should be ready soon.

So far, I've only used three anime series -- Ranma, Sailor Moon, and Tenchi. I suppose I could do Utena, and it might be fun to mix in Space Pirate Mito with Washuu and Ryoko.

I'm fairly familiar with, and will (eventually) use more than twenty series in my stories, but it's only the seven that I'll use often enough and will play significant roles in any given plot. Many of the series I'll only use once or twice, playing a major role at least once. That is mainly because I prefer writing stories with Ranma as the protagonist, but only so many series are easy enough to work with regarding whatever plot idea I may want to put together. (I almost added Slayers, but I've only got one significant role for it and two third fiddles.)