Here's Waiu *One of the midbosses from Kirby's Dreamland 2 for Gameboy* when he was a child.
Young Waiu grew up in Knuckle Village and is from a Knuckelf ninja clan. He happened to known Muay Thai Marian and are rivals too.
At 9 years old, he would face Marian whenever she travels with 9 year old Dylan and 10 year old Jeri, he wanted to be as strong as a ninja as his parents too.