Harry doesn't need any of the special powers of his other lives to be awesome, just a bit of self-confidence, the ability to think things through and follow up after the immediate moment is past, and the motivation to not be such a slacker. Potterverse magic lacks major direct damage effects, but if you just combine the various exploitables it is godlike in the support/utility roles, and with a whiff of planning and effort mundane physics can do all the direct damage you could ask for.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows