Nataku Son

is a child from Tokyo who was attempted to turn into a Flame Human by Rekka Hoshimiya but failed.

Appearance
Takkun is a young child with light-blonde, short wavy hair and small black eyes. He dons a light a v-neck sweater, a black shirt, black trousers and black shoes.

Personality
Alike any other usual child, Takkun was a straight-forward and kind individual. He showed bravery and willingness to stop Rekka from turning innocent people into Flame Humans.

VS. 1st Special Fire Brigade arc
While walking with his friend, Takkun was confronted by Tamaki Kotatsu in the streets and was carried off to an abandoned warehouse, being told that there was a way for children to be immune to the phenomenon, he followed. At the arrival, Takkun was frightened to see Rekka turn another human into a Flame Human via artificial means, and while trying to stop him from doing so, was bitten by the Bug, and began transformation into a Flame Human. However, Takkun seemed to be compatible with the flames and did not transform into a Flame Human.