kokonoe_tamaki
Character from CU-NO.
Also called Shishou (teacher/master).
Has very long purple hair with an ahoge and usually in a ponytail.
Has purple eyes and wears glasses.
Has large breasts.
Profile
See post #2112265.
An earlier profile is at http://web.archive.org/web/20130818171436/http://lagoon.shisyou.com/sisyou.html