The Vanilmirth has the highest stat growth (and highest stat variation) compared to the other three Basic Class Homunculi: Amistr, Filir, and Lif. It is capable of using magical attacks such as Caprice and healing skills such as Chaotic Benediction, although both skills have random effects. It has a passive skill, Change Instruction, which not just raises both STR and INT, but also raises the potion creation chances when it is not vaporized. Once Vanilmirth has evolved and become loyal, it shall be able to learn Bio Explosion, a suicide attack that deals massive splash damage, but at the cost of all of its Intimacy.
There are only 2 species of Vanilmirth. Transforming Vanilmirth from its adolescent appearance into a mature form requires a Stone of Sage when it possesses loyal disposition towards its creator.