Orson Scott Card is harder to match.
Very true. Planets
, maybe. For the hardscience SF and introspection part.
That said I'm not sure that what books someone reads are more than a slight
indication to what a might enjoy in manga. I know for a fact that although I like the affored mentioned Ah, My Goddess
in its manga form, I'm not so keen of some novelization I've seen (by the same author, mind you).