A fetish topic... oh boy... this may not go very well.
But to be clear,
NO LOLIS - with one exception: Ilya (Type-Moon). That's probably because she ain't harmless. Hell, she'd kill you.
Let's see. Any of these combinations will do.
Tsundere (the only "dere" I'll allow to exist).
Short blonde girls. Strong ones (physically and/or in spirit). Twin tails. Leaders. Nice ones.
When it comes to outfits, blah blah blah - I don't focus on any of those things in particular. Sometimes, I may treat them as bonuses, like glasses and so forth.