He might like the Skulduggery Pleasant books! It's got a female lead, but it's quite action-packed with lots of fight scenes, and there's monsters and vampires/werewolves/etc. And no romance that I can remember (I AM only on the third book, though. It might pop up later).
Maybe also Blood of Ambrose? There's a sort of zombie in there, and no real romance. Might be a bit TOO violent, though; it's got pretty graphic descriptions of beheadings and torture and things like that. You may want to check it out first if you're worried about such things. D:
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