User blog comment:DShadow7/Neptune And Jaune Are Similar?/@comment-3387274-20140815101348

Neptune is kinda a foil for Jaune; he tries to be cool normally, much like Jaune, tries to flirt, and also ends up being a sane voice of reason.

They're opposite in many ways though: Jaune actually manages to keep calm when things go serious, whereas Neptune loses his cool very easily. Neptune actually succeeds in his flirting, but seems to just treat it as a game whereas Jaune genuinely seems to have a single crush on Weiss that he persues futilely..

In short, they kinda reflect each other in many ways