Asuma Ogasawara is a supporting character in the second season of the anime. He is twenty-one years old and works as an idol, affiliated with D-Four Production where he serves as the leader of the idol unit ACE. His birthday is on December 7 and his blood type is O.

In terms of appearance, Asuma has pale grey-brown spiky hair that sticks up in various directions, complemented by sharp red eyes. He is typically shown wearing casual attire accented with gold, which serves as his theme color, and he rarely wears the D-4 jacket or other coordinated outfits. His expression often displays a playful or mischievous smirk.

Asuma's personality is defined by his playful and affectionate nature, though he tends to express this through rough physical gestures. He enjoys showing affection by punching someone or tickling them while telling them to be in a better mood or to lighten up. He has a tendency to call younger idols cute or use other complimentary terms when addressing them. Despite his boisterous approach, he is unable to handle receiving similar treatment in return and will quickly stop and apologize if one of his unit members threatens to retaliate against him.

His role in the story is as a supporting character, contributing to the dynamics of D-Four Production and leading his unit ACE. His key relationships are primarily with his fellow unit members, though the specific nature of those bonds involves the playful give-and-take that characterizes his personality. As a leader, he balances his mischievous demeanor with the responsibility of guiding his group. Throughout the series, his development revolves around his interactions with other idols, particularly in how his rough affection is received and reciprocated. Standing at 177 centimeters tall, his notable abilities are those expected of an experienced idol and unit leader within the D-Four Production agency.