ok i know that this is not real.
but i would be very dissapointed if the sequels villain would be radits.we would need 5 movies to get to a real badass villain like vegeta or frieza.
those are adaptations so IMO you can not have every villain. DB:E shows that you need to fit the story in one movie. in this movie goku finds the dragonballs for the first time and meets roshi and the villain is piccolo. this was not in the cartoon. and i am happy.
i say in the sequel it should be vegeta with frieza coming to earth. now for example BB had a lot of villains from the batman comics. if you writte a quality script it can work. so maybe have frieza in he end of the second movie or in the third. i know that a lot of people dont like TF and ans were not happy that megatron was only at the end. but megatron had a lot of screentime in TF. so maybe something like that with frieza in the sequel? maybe in the middle of the movie vegeta nad goku fight. then at the end a huge epic battle with piccolo,vegeta,goku against frieza and hes aliens. of course you would need a budget of 150 millions for this. IMO FOX will never spend 150 millions on DB. maybe if DB:E would make 300 domestic. but no way.
raditz IMO would be a very weak villain.