Waganma

Waganma (ワガンマ, Waganma) is the son of Narinki.

Monster Raid Arc
He and his father are seen eating in a restaurant with Metal Bat guarding them. They are later attacked by members of the Monster Association and despite Metal Bat's Mohican's and Pineapple's best efforts he is kidnapped.

Trivia

 * "Waganma" is a play of words of "Wagamama" which means "spoiled"