Komoe is basically a miniature version of Tomoe—same green hair, same cute factor that has everyone wrapped around her finger. She's small enough that people constantly dote on her, which she absolutely takes advantage of.
Here's the thing: Komoe is literally a fragment of Tomoe, created using Tomoe's own abilities. But what makes her unique is that Makoto's Draupnir—his legendary ring, charged with his mana—was used as her core. Tomoe considers her their child because of this, and Makoto's on the same page, treating her like his daughter. Since she's technically the Young Master's kid, everyone in the demiplane spoils her rotten.
Content compiled by AnimeList.moe from publicly available sources.