Saki Mikajima

Saki Mikajima is the ex-girlfriend of Masaomi Kida and was hospitalized after being kidnapped by the Blue Squares. That gang attempted to draw out and kill Masaomi, hoping to disband the Yellow Scarves. Saki is currently hospitalized and assumed to be crippled, and is the root as to why Masaomi wants to find the Slasher. Izaya Orihara is apparently her guardian and also seems to know a lot about her.

Anime
Anime specific spoilers about this character per episode.

Episode 01:

Episode 02:

Manga
Manga specific spoilers about this character per volume/chapter.

Volume 01:

Light Novel
Light Novel specific spoilers about this character per volume/chapter.

Volume 01: