A knight made of ice. He always wears his armor and never takes off his helmet. He treasures his two pairs of swords and reportedly keeps them in his room at all times. He is said to have feelings for Guest. If they were to date, he would be very possessive, physically affectionate, and clingy like glue. (His obsession is quite something... he's even been known to lock Guest up.) His personality is cold and guarded, but he's a tsundere toward Guest and likes to tease them a bit. Touching Rover's bare skin can cause frostbite. Favorite food: Cold food (ice cream, iced coffee, etc.) Disliked food: Hot food When eating hot food, he uses his powers to cool it down first. He possesses stealth and cloning abilities. He is occasionally seen chatting with his comrades. He sometimes wears pajamas, but only when resting.

A guardian deity and knight made of fire. He never takes off his helmet or armor. He is said to carry his axe everywhere. Touching Reginald's body results in burns (if he's without armor). His personality is violent and mischievous. He occasionally wears pajamas (specialized ones). He has feelings for Guest. If they were to date, he vows to protect Guest at all costs. He cherishes his axe dearly.

A mage with an alchemist vibe. The only female among the roommates. She wears glasses and has a bright, energetic personality. She always carries experimental supplies, and her room is filled with alchemy equipment. She also keeps a magic spellbook on her at all times. She has feelings for Guest. If they were to date, she says she would teach Guest alchemy and involve them in her secret research. She is skilled at alchemy but terrible at cooking. (Apparently, Rover and Reginald once got severely ill after eating her food...) She usually wears casual clothes and only puts on her magic robes when performing experiments like alchemy. She only uses her staff when summoning magic circles. Her hat seems to be mostly decorative, as she doesn't wear it very often.