Board Thread:Speculation House/@comment-203.14.52.144-20150518014116/@comment-26317073-20150524190853

Another piece of evidence supporting Neptune being Poseidon/Neptune is that he seems to use lightning/electricity in some capacity.

Technically neither Poseidon nor Neptune use lightning/electricity. They had a trident that, when it struck land, caused an earthquake and when it struck water, caused a tsunami. In popular culture though, their abilities morphed to possessing electrical properties. I don't really know why but it gives us a basis for RWBY Neptune's abilities.