Bleach(don't know how you could get some type of power) ........Naruto(have a chance to become a ninja).......... One piece(train hard or eat a devil fruit).......and fairy tail(chance to do magic thing)
and remember you have to train your self to gain power and abilities
I would like to be in all really, Live my life out in one then move on to the next haha.
In Bleach I would like to be giving powers like Rukia did with Ichigo then learn kido, proper kendo, and how to use retsu.
In Naruto I would like to be in Konoha, attend the academy to learn the basics then ask jounins like Gai, Kurenai, Kakashi, and Tsunade to train me in Taijutsu, Genjutsu, ninjutsus, and medical ninjtusu (so I can heal myself as Kabuto did in part 1). I would like to train with Jiraiya if he was still alive since he's a good teacher.
In One piece I would train in Haki, physical strength, speed, hand to hand combat, sword/kendo, and sniper (having a devil fruit would require more training and leaves you with a weakness).
In FT, I'm not sure which type of magic I would want to focus on since there's a lot of good ones and we do see mages who can use more than once type such as Ultear, that memory guy from Sabertooth, Hades, Jellal, Erza (her armors give her access to different types of powers). I would like to use time magic like Ultear and the magic Jellal uses so I would like to train with both of them since they are a team now anyways.