I tend to cosplay when I have no other ideas for a regular avi. I mostly cosplay as BL characters though, so- A lot of them are from manga and BL VNs. Also, some cosplays from obscure indie horror games like Mad Father, Yume Nikki, .Flow, Misao, etc. And obscure anime fandoms, like Monster.
Some characters I've cosplayed as include- Most of the boys from DMMD (Except for Mink and Mizuki) + the different versions of Aoba like Shiroba, and I tried making a cosplay of his perfect form, but it didn't turn out so well. xD Also cosplayed as Nain (Aoba's dad).
The boys from Free!, Sherlock and John, the boys from Supernatural, Kaworu from Evangelion, the boys from Crimson Spell, Johan Liebert from Monster, Yashiro from Saezuru Tori wa Habatakunai, EarthBound characters, Shitai-san, Seccom Masada-Sensei, and Madotsuki from Yume Nikki...
< _ > I have a lot of cosplays...
Every time a new item with a clear theme based on my favourite characters, I always get ridiculously excited. When No Rhyme or Reason popped up, I just went crazy. Had to get my hands on one immediately, and then got 3 more because 1 wasn't enough.
If I had a cosplay ticket, I would either make a set based on Akira and Shiki from Togainu no Chi, or a set based on Youji and Tetsuo from Sweet Pool. I'd probably pick the Sweet Pool one though, because it's my most favorite BL VN ever. (I even have some secret mock-ups of both of the sets. Filled with hidden poses. XD)
Too bad I will never get a ticket.