Kiyoshi Kori is the wielder of the Iceage Mutantrix.
History[]
He is the son of flower coordinator Makiko Kori, who received bad press due to her son's actions. Obtaining the Iceage Mutantrix to become the Iceage Mutantborg, Kiyoshi uses it to attack anyone who makes him mad such as Kentaro when he unintentionally shoved Kiyoshi out of the way while looking for Makiko.
After his clone is destroyed by Cyber NRG's powers, believing the Mutantborg to be the one he is looking for, Kiyoshi runs into his mother as she takes the Mutantrix from him to take the blame for the attack.
However, Shotaro uncovers the truth as Iceage Mutantborg is defeated by NRG and You calls the policemen to arrest Kiyoshi instead of killing him in revenge. Up until this time, the Iceage Mutantborg is only referred to as the icy Mutantborg (氷のドーパント, Kōri no Dōpanto).
Powers & Abilities[]

Iceageborg.
“ | Iceage! Mutant Up! | ” |
–Transformation announcement |
With the power of Iceageborg, he has the ability to make absolute zero ice and use it in any fashion, from attacks to clones.
Weaknesses[]
He can be defeated by the fire-based aliens.