It's a normal expression. Being an anime character does not make it odd...
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Anime is a form of fantasy and so the characters will resemble people that come from the artist's fantasy, often their own ideals. Add to that the societal value of slenderness you will have the over-exaggerated anime body proportions of super skinny characters.
No there are not any characters called tegan.
It used to be called "anime style," however, it always has the word "anime" in its title
Try to go to different anime boards and asking people based on the description of the anime. Or you can also google specific names of the characters that popped up in the anime.
There are many, including Hideyoshi. In addition to the previous answer, a plethora of anime characters don hoodies for their everyday garb. If you'd like to look, the Anime Character Database actually has an entire tag devoted to hoodies. See the related link.