The secret to Nanoha is that they took a Gundam anime, removed the mechas and reversed everyone's genders.
Nanoha as a guy would be an epic GAR hot-blooded mofo, blasting down enemies by the hundreds regardless of the collateral damage.
Fate would be the silent and distant type, slashing through his foes so quickly they don't even realize they're already dead.
Arf would be his more vocal companion, dedicated and loyal; you'd all be crying MANLY TEARS when he'd sacrifice himself for his master's sake.
And we'd all be fapping to Yuuno-chan's moe helplessness.