"Hikarian" is a proper noun, and unique to this anime. Ordinary dictionaries don't have this word.

In the Wikipedia article, I can see almost all of the characters are named after Japanese trains or famous stations. English Wikipedia article has many links to the original Japanese trains.

According to the Japanese article, "Hikarian" is the name of a planet (ヒカリアン星【せい】)(星=star) and the name of aliens (humanoids) living in that planet. The main heroes in the anime seem to be all Hikarians. So I think the ending "-an" is English suffix "-an", as in American or christian. The word ヒカリアン was created by someone to mean "people in Hikari planet".