It has always been Kasumi's dream to become an idol, but she didn't get very far. She wants to be a school idol so that she can participate in activities with a senpai she adores. Along with Karin Asaka and Setsuna Yuki, she works with Dengeki Online. As she loves all things cute, her unrivaled love for idols is strong and inspired. With the goal to dominate and become number one, she's a pretty sore loser when she comes with anything other than first place, even to the point of sabotage or cheating. She hates the nickname Kasukasu (かすかす) which roughly translates to "just barely" or "not quite", and gets in a bad mood when referred to it. You'll often find her scheming or thinking up new ways to ensure her own victory, however, usually these plans often fail or aren't as devious as she thinks.

Kasumi is a mid-high range, with alot of energy to her voice.