HIT_ME_IF_YOU_CAN
purely based on speed, if Kira has the stamina to continuously spam Thunderclap and Flash(or godspeed which is faster but idk if he has unlocked it yet) the humans of this world, no matter how good they are don't stand a chance, Thunderclap and Flash speed is about 172.1 Km/h and the fastest human we know Usain Bolt is 43.99 km/h that is approx 4 times faster.. this is one of the reasons the only weakness of a speedster(in most cases) is bad authors and plot, you just can't beat speed without even faster speed man(well there is the stillforce but we don't talk about that). Keep up the good work author, gib more chapters we'll gib more shiny stones