 If you liked
Kimi ni Todoke
|
 ...then you might like
Beast Master
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In Beast Master, Leo is a guy who's avoided because he's scary-looking, when all he wants to do is make friends, just like Sadako-chan. Then he meets Kubozuka Yuiko, a popular girl who doesn't think he's scary and befriends him. Eventually everyone finds out that Leo isn't at all as scary as he looks.
These two mangas are similar because both the main characters have a scary face, yet kind personatliy underneath. they also have a signficant other that reveals their true self to everyone and eventually they fall in love with eachother. Both very good reads :}