Some of these are spoilers
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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.
It depends on the Anime. Some characters blink while others do not. It could be due to the animation style of the company. It also might be too hard to remember when they should blink in order for it to look natural.
No there are not any characters called tegan.
It's a normal expression. Being an anime character does not make it odd...
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.