Masuyo Ikari

Homeroom teacher of Kimengumi during their Middle School days (Homeroom teacher for Kojougumi during High School). She is a beautiful speech teacher with a hysterical personality.

The Kimengumi refer to her as "Ikari Kong" (イカリコング). She actually used to go to school with Kimengumi as their senpai. She later marries Sessa-sensei and has a son named Tenma (天馬, Tenma?). In the anime she will often say "Ikari masu yo!" (怒りますよ！, I'm very mad!?) when angered.

(Source: Wikipedia)