Touhou x Child!Reader: Young but Old Inside

A child from the outside world, a descendant of a strong magician lineage. This child is the strongest in the bloodline and yet, he don't need to sleep, or eats or drinks, he don't need to shower but still clean

Due to the circumstances, his mental ages is over 30 and he is fucked up in this story

And he is somewhat intelligent. Instruction unclear: Bad at using it

Carefree and most likely a bit abnormal

Despite he is old in mental age, he still emitting some arrogance