Anime where protagonist is overlooked as being weak but then turns out to be better than most (pref. shounen/action like HxH)

Basically anything similar in premise to HxH, I really want to watch characters develop from either pretty weak (Gon) or be overlooked like Killua etc. Hunter X Hunter is just such a good show and I haven't been able to find anything like it.

Full metal alchemist was alright but too slow and storybased, I want something a bit more actiony with archs like HxH, **I loved the exam arch** .

Edit: Another great example of what I want is Naruto (minus the filler episodes)