Serena, the Brigade Witch. She has a slothful nature, and would prefer to watch anime and play video games (especially adult dating simulators) most of the time. When she rises, though, she resembles a Celestial from The Melancholy of Haruhi Suzumiya.
Accordingly, her Barrier resembles the Closed Space, but is also filled with TV screens depicting various anime and video games. People who get into these become entranced and cannot pull themselves away.
The Witches Familiars are three high school girls in sailor uniforms. Two of them, the ribbon-wearing Lita and the busty, bespectacled Amy, welcome guests with their adorable moe charm. The remaining one, the twin-tailed Raye, serves to provide homework for the Witch to copy.
Those hoping to defeat the Witch must cater to her every demand.
Konata. Her Witch name is Usagi's dub name in Sailor Moon, and her Familiars' are those of Makoto, Ami, and Rei respectively. Along with Haruhi being her favorite anime and the character she cosplays as in episode 16, she also writes "Brigade leader" as one of her career choices early the next. Anyone who's seen the OVA, though, will know how terrible a leader she'd be (something which I had also referred to in Starbound).