In my canon,
Radon is 12 and taller than Voltage.
Voltage is 15 and shorter than Radon.

Radon is fast, because he trains under Voltage.
Radons top speed is:
13,000 mp/h.

Voltages Top Speed is:
1/3 of the speed of light A.K.A: HYPER-SONIC SPEED MODE. (Non-Flash Drive)

Voltages Top Speed with Flash Drives on:
2/3 faster than the speed of light.

Super Voltage top speed:
5000x The Speed of light
(3,353,083,145,000)

Voltage’s Universe measure universes by calling them ‘AKT’ (Ah-cuh-t)

Super Voltage is invincible to an extent, only to be hurt by solar a system/galaxy busting beings.