PK can withstand to any type of poison.

This is because of his errands to the nameless hill, sent by Eirin for when she needs to examine poisonous substances.

After meeting Medicine Melancholy, she and him became friends and learned how to nullify poisons when injected or ingested.

Thanks to his background knowledge of chemistry, he assists Eirin with antidote creating at Eientei.

His favorite cakes are Tirimisu, Ice Cream Cake, Cheesecake, Carrot Cake, and Red Velvet.