I like
Roderick without a nn best. I think
Rod is just kind of bland, and
Roderick is very handsome. I don't think
Roderick Lysander is too much, since
Roderick isn't too unusual. I also prefer two or three syllable mn's to one syllable, but more than that the middle name needs to be as strong and handsome as the first. I'm not great at combos but maybe:
Roderick Henry (very strong IMO)
Roderick SebastianRoderick NathanielRoderick MaxwellRoderick GrantRoderick PrestonRoderick Ambrose