Both are goofy, outgoing unlike Zoro who is more stoic and reserved, fun loving, love adventure, freedom chasers and reckless, Ambitious. Is that enough personality parallels for you?
Now personality parallels between Zoro and Roger: Can become a demon if friends are threatened, will forgo their honor and bow down to accomplish their goals, Ambitious. Please let me know what else.
Is that enough personality parallels for you?