Attached Link: Hiro pic at my gallery

As mentioned before, Hiro makes great companion for Aiko, both in her toony and realistic versions. He can use any MilleniumGen3 male texture (female too, but too much makeup doesn't suit him :P) and indeed comes with H3-to-D3 figure, allowing to put David clothes on him (similar to A3-to-SP3 figure which comes with A3 Complete). It sometimes makes life easier (there's cool Imagination Gown for David at DAZ freebie archives, makes nice wizard for Hiro too ;) ), but there's more freebie clothes for Hiro than for David... and they're of better quality, at least those made by Adzan (DAZ Freepository forum). Can't tell much about pay-for items, I'm buying stuff with GC's I won in various contests, that isn't awfully lot of purchases ;)  As for hair, usually any Aiko hair fits Hiro too - at linked pic Hiro wears Nyoko Hair (Aiko stock hairdo) without any tweaking.

Personally Hiro is my third favourite figure - right after House Mouse and Aiko ^.^

In few words: if you like Aiko style, and you need man for her, Hiro is the best and only right choice :)

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Outdated gallery over at DeviantArt

Fics at FanFiction.net and Archive of Our Own (AO3)