I have a lot of wallpapers with pictures of Super Saiyan characters from Dragon Ball series. Such as this one, an awesome picture of Future Trunks in Super Saiyan form. Designed in high resolution, this picture can be a good wallpaper with 1920×1080 pixels resolution.
Future Trunks is the Saiyan and Earthling hybrid son of Future Vegeta and Future Bulma from an alternate future. Trunks is trained by Future Gohan as a teenager and becomes a gifted fighter, swordsman and a Super Saiyan. Trunks, having never met his father, nor grown up under his influence, combined with the fact that he grew up in an apocalyptic world. Because he comes from the future and believes he knows what is going to happen, Future Trunks is usually shown thinking that only some things will matter and others probably would not.