Nope, I don't watch Hellsing. I've only began watching anime again about a year ago, and haven't really gotten into the older animes at this point.
For video games, I really want to cosplay as Zelda (maybe Hilda too from A Link Between Worlds), but that is done a lot, so I would need to figure out how to make it my own. I also thought of being a Pokemon trainer (kind of childish, but fun), a humanoid version of Amaterasu from Okami, or a Final Fantasy character (there are a lot of them, so I can't list them all). My two favorite animes (Fairy Tail and Sword Art Online) have some great cosplay opportunities too.