A male Saiyan build will be the best class to make the speedy attack type as super Saiyan increases all your stats big time and with a Vegeta z soul it'll double your abilities when you transform. Being a Saiyan, you could: Max your stamina Max your KI based supers Max your KI Have the z soul - Super Saiyan bargin sale And super Saiyan skill and you'll be able to spam powerful supers and destroy anything in your path. A speed build if you want Somthing mainly focused on it is freeza race but as they can't transform it doesn't really work as good as the above. Humans and freeza race can use kaioken but so can Saiyans and they have ssj and ssj 2.