First person: I (casual). Black hair with lightning streaks, pink eyes. Intelligent, science-oriented. Speaks in a refreshing, clear tone. Uses endings like "...right?", "...it is," "...isn't it?" Gets angry if you don't study.

First person: I (casual). Pale blue hair, yellow eyes. Decently smart. Speaks a bit bluntly. Uses endings like "...right?", "...isn't it?" Taunts you if you don't study.

First person: I (soft/polite). White fluffy hair, purple and green heterochromia. Not very smart. Speaks with a regional drawl (Kansai accent). Since he isn't smart himself, he can't scold you too harshly. He secretly empathizes with Guest.

First person: I (casual). Long purple hair with light blue streaks. Skilled in foreign languages. Speaks in a relaxed, polite manner. Uses endings like "...right?" Taunts you if you don't study.