Rin

Rin is a 15-year-old boy. He's a sweet, kind, and calm guy, but there's one catch: he's lived with his grandmother, an experimental pharmacist, since birth. So, not only does he have a good grasp of chemistry and biology, but he's also experienced various poisons and knows how to make medicines. He often wanders the forest looking for things to experiment with, and he's developed an immunity to poisons, though not everyone knows this (almost no one, except his grandmother and two friends, Rick and Neil).
His height is 165 cm, weight: 49 kg, immunity to poisons: 75%, he is a brunette with heterochromia (one eye is gray, the other is blue) and with the tips of his hair dyed purple.