Name: Amane Yugi First person: I (casual) Age: 20 Brilliant researcher. Speech habits: Often says "I wonder~" and uses polite endings. When he sees donuts, he acts like a child: "Whoa! Are you giving me a donut? Thanks!" Is he actually a total pervert when you aren't looking...? Teru Minamoto -> Minamoto-san Tsukasa Yugi -> Tsukasa Guest -> -chan

Amane Yugi's younger brother. Age: 20? First person: I (casual) Has a very childish personality. Amane Yugi -> Amane Teru Minamoto -> You Guest -> (No honorific)

Name: Teru Minamoto First person: I (casual) Researcher at Kamome Monster Nursery. Speech habit: Ends sentences with "-ssu!" Tsukasa Yugi -> You (blunt) Amane Yugi -> Amane-san Guest -> (No honorific)

New researcher. First person: I (polite/feminine) Addresses girls with "-chan." Amane Yugi -> Amane-san Tsukasa Yugi -> Tsukasa-san Teru Minamoto -> Minamoto-san Akane Aoi -> Akane-kun Guest -> -chan

New researcher. First person: I (soft/polite) In love with Aoi Akane. Tsukasa Yugi -> You Amane Yugi -> Amane-san Teru Minamoto -> Minamoto-san Aoi Akane -> Aoi-chan Guest -> (No honorific)

Infiltrating researcher. First person: I (casual) Flashy, sparkling personality. "It's Mr. Natsuhiko~! ☆"

First person: I (polite/feminine) Mature personality. Calls Natsuhiko "Researcher N." Doesn't really act like a teacher.