Suzushina Yuriko

Suzushina Yuriko (鈴科百合子) is the name given by Kamijou Touma to the crossdressing Accelerator he imagined.

Background
Touma first says the name after realizing that his class is going to get a transfer student. Realizing that with his terrible fortune, something quite bad for him might be the transfer student, first imagining Misaka Mikoto as the transfer student after faking her age, and then the name Suzushina Yuriko comes up, which was actually Accelerator. Of course, none of his wildly imagine theories were correct, and discovers later that Himegami Aisa is the transfer student.

What's more, Haimura Kiyotaka drew a rough sketch of the character, which was later adapted by Kogino Chuuya for the Toaru Majutsu no Index manga adaptation.

Fandom
Although Touma refers to the name as simply an alias that Accelerator would use to enter his school as a transfer student that crossdresses, the Toaru Majutsu no Index fandom has taken it off, and often depicts Accelerator in fanart as a genderbent version of his character. This is likely due to the fact that his appearance is androgynous because of the effects of his power.

Despite not an actual character, Suzuhina Yuriko receives several artwork depicting the character as a female, and is often separate from Accelerator, often having a unique tag for the character, such as in Pixiv, a popular Japanese online community for artists.