Aw yeah, if you already know your rolls and breakfalls, Aikido is a great thing to check out. At lower levels, the "attacks" are basically two-person katas, usually involving escaping from grabs. At upper levels they do have something called randori but even then it's all very structured. Aikido gets made fun of sometimes for not having a "live" adversary who's actively trying to beat you. I've read there are some dojos that do competitive Aikido, but I think that's rare.