Animate fireball, electrical ball, ice ball, electrical storm

I am building a fighter video game. I need animations of the following: fireball, electrical ball, ice ball, electrical storm. These need to have transparent backgrounds. I need 8 frames of the animation. The idea is that these animations are produced by one character and they hit the other character. The characters and background are already created. For example, I would need the fireball to form and then explode as it hits the other player. You don't need to worry about creating the players or the background, as long as you create the frames that make the fireball form and then explode, that is what I am looking for. I can handle the position of the fireball and the movement of the fireball from frame to frame. I am also handling the coding on my side, so what I need is the pictures created.