レインボーイズ Reinbōizu) is a band led by Mametchi that first appeared in the Tamagotchi! Yume Kira Dream anime. It also made an appearance in GO-GO Tamagotchi!. It may be a male version of Yumemitchi's band, the Kira Kira Girls. The name of the band is a combination of the English words "rainbow" and "boys".
Their debut song as a band is Powerful Beat and so far, this is the only song they have been seen performing.