I usually play games where, by default, the MC is male so bearing that in mind:
If it's an RPG, I usually go with "Hiro", uncreatively.
If it's something like a VN or something like that where the characters have Japanese names (or at least, most do) I go with "Akira"
And if it's a games with Western-style names primarily, I'll go with "Mathias"
Although, if there's a given name I usually go with that.