Not through time, but from another world entirely. I come from a world where Riders and Super Sentai, fought a massive war. I was sent here to find the Rider powers that made it to this one, passing through the walls that separate this world from other worlds. Dimensional Travel as its called.

[He shrugged.] For you not to know of Riders, makes it difficult at best to find out if they do reside in this world. But you did mention however that some are "fanboys" was it? That makes it odd in itself...