Because he possesses a high pride due to being a founder, he looks down upon vampires of other bloodlines. Beautiful blood is his preference and often utters narcissistic remarks. Ordinarily his words are polite, but when he loses his temper his speech will become violent and his speech would often contain hurtful or insensitive words.
The 'Positive-kun' alluded to in the title. He's a very optimistic individual and sees the bright side of any situation and is on the impulsive side. He is in a relationship with Jun.
The antogonist who constantly harrases Choi Ida, and hates her for capturing Gang Naru's heart when she couldn't so she tries to make Gang Naru not want her by revealing her identity as Choi Yodah which works only for a little while. Her family ends up in poverty as her father's actions are discovered and he is arrested for them.
The protagonist. He traveled to America from Japan to visit his brother, Ken. After certain circumstances, he is infected by the plants growing all over the world. This causes him to become a hybrid half-human half-plant man.