Omatsu serves as the "ochako" at Sekitei theater, tasked with preparing the stage and keeping everything primed between rakugo performances. She presents with light brown or blonde hair tied in a ponytail, purple or pink eyes, and a slim build typically clad in traditional kimono attire.

Generally relaxed and easygoing, Omatsu nonetheless displays a habitual drinking tendency during her free time. This habit sparks arguments, particularly with Sekitei's manager, Sakujiro, though she cares for him beneath the arguments, offering encouragement after physical confrontations. She exhibits a flirtatious side, especially noticeable in early interactions with Mameda.

Within the theater community, Omatsu maintains respectful relationships. She holds the prominent rakugo performer Bunko in high regard and gets along well with the shamisen player, Koito. Her dynamic with the key rakugo figure Byakudanji Tsubaki remains less defined. While typically laid-back, she shows moments of protectiveness toward colleagues, stepping in to shield Sakujiro from debt collectors.