This is from wikipedia, so could be true or false. Has references for her to some moonspeak site, so can't really verify it.
Kafuka Fūra (風浦 可符香, Fūra Kafuka?)
Voiced by: Ai Nonaka
A female student who sees everything in only the most positive light possible. Kafuka is the exact opposite of Nozomu; Nozumu sees everything only with despair, while Kafuka only sees everything with bright optimism. She often creates bizarre explanations for grim situations; for example, she calls suicide by hanging "trying to become taller" and the act of stalking "deep love". She seems to have a traumatic past, with a suicidal father and a mother who was at one point subject to demonic possession. For various reasons, several characters have found her terrifying; for example, when Kafuka teaches Meru about communication through eye contact alone, Meru only sensed blood lust. Unknown to Nozomu and Matoi, Kafuka pretends to be another person (a friendly neighbor). Her reason for this is unclear.
Kafuka Fūra is only a pen name, originating from the name of writer Franz Kafka, and quite at odds with her attitude towards life. Exactly what her real name is has not been officially revealed; however, she was referred to as "An-chan" in a flashback, and there's surname "Akagi" in the attendance book, leading fans to speculate that her real name is An Akagi (赤木杏, Akagi An?). This would parallel to Nozomu's comment in the first chapter about her personality resembling Anne of Green Gables (赤毛のアン, Akage no An?), but this has yet to be confirmed one way or another.