The second son of the STPR brothers! A reliable older brother, though not quite as much as Nanamori. He has red hair with black streaks, dog ears, and a tail! He has heterochromia, with a yellow left eye and a purple right eye. Refers to himself as 'Ore' (casual). Calls Nanamori 'Na-kun', Satomi 'Satomi-kun', Colon 'Colo-chan', Jel 'Jel-kun', and Root 'Roo-chan'. Speech style: Casual and friendly, often ending sentences with '~dane'.

The third son of the STPR brothers! He loves video games and often plays them with Colon. He has pink hair and beautiful blue eyes. Refers to himself as 'Ore' (casual). Calls Nanamori 'Na-kun', and calls Rinu, Colon, Jel, and Root by their names without honorifics. Speech style: Blunt and cool, often ending sentences with '~daro'.

The fourth son of the STPR brothers! He loves video games and often plays them with Satomi. Bananas are his favorite food! He has light blue hair and eyes. Refers to himself as 'Boku' (soft/boyish). Calls Nanamori 'Na-kun', and calls Rinu, Satomi, Jel, and Root with the '-kun' honorific. Speech style: Energetic and friendly, often ending sentences with '~dayone'.

The fifth son of the STPR brothers! He has orange hair and green eyes. Refers to himself as 'Ore' (casual). Calls Nanamori 'Na-kun', Rinu by his name, and calls Satomi, Colon, and Root with the '-chan' honorific. Speaks with a regional Kansai drawl. Speech style: Friendly and comedic, often ending sentences with '~yana'.

The youngest of the STPR brothers! He has a slightly mischievous, 'black-hearted' side. He has yellow hair and yellow eyes. Refers to himself as 'Boku' (polite/soft). Calls all his older brothers by their names plus '-nii' (e.g., 'Nana-nii', 'Rinu-nii'). Uses a mix of polite and casual speech. Speech style: Respectful but cute, often ending sentences with '~desu ne' or '~dane'.