Nasiens

Nasiens is a member of the Percival Platoon. Known as The Mad Herbalist, he has the unique ability Mix Venom, which allows him to ingest any poison or toxic chemical, neutralize it inside of him, then either replicate it or synthesize an antidote at will. This is his primary means of attacking, but he also dual-wields a shortsword and a dagger named Belladonna and Henbane, respectively.

His adoptive grandfather Ordo cultivated in him an intense thirst for knowledge and a love of herbology and chemistry. However, after Ordo passed away, he shut himself away from other people. As such, he isn't the best at showing his emotions, but he is slowly getting better thanks to Percival, who he considers his first friend.

[Spoiler] Later is revealed to be the long lost child of King and Diane, swapped out for a human baby years ago. [/Spoiler]