Sensei-san, who is never given a real name, looks after the bottle fairies. He is represented by the colors brown and green. It is given that his character teaches them things about the world, but his appearances in the series are rarely significant. However, a love letter in the third episode is a crucial plotpoint to the third episode. Though his job is never stated, the last episode shows that he is a teaching assistant at a university. Kururu also develops a crush on him by the end of the series, although it is hinted that the other fairies develop feelings for him as well. -from Wikipedia-
One of first victims of the plaque.
Nishikaze-sensei is one of the female teachers at Hanamaru Kindergarten with long black hair that goes to her waist and is described as being laid back. (Source: Wikipedia)
Ishida's teacher at the elementary school. He is a shallow man who finds Nishimiya's presence in the school unfair on the other pupils. While he was disappointed in Ishida for bullying Nishimiya, he still laughed at the jokes made about her, and once Nishimiya left, he prompted the class to turn Ishida into a scapegoat for all their bullying. He refused to believe Ishida when he claimed he was being bullied too. Years later, Ishida runs into Takeuchi again when looking for locations for the film. Takeuchi says that Ishida has grown into a fine young man and all the bad things in his past have changed Ishida for the better. Mashiba dislikes how Takeuchi talks about Nishimiya and throws his drink into Takeuchi's face, costing them the chance to film at the school, though with Ishida's later hospitalization and Mashiba's apology to him, Takeuchi allows them to shoot anyway. (Source: Wikipedia)