 If you liked
Kekkaishi
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 ...then you might like
Shijou Saikyou no Deshi Kenichi
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The main character was weak as a duckling can be in terms of their ability, though in Kekkaishi, the hero start off with a bit of basic. If you've read Kenichi, then you should read Kekkaishi. Both have similar master disciple relationship. Both have similar hero and heroine relationship. All in all, full of badassery.