Crazy theory
I literally don't have any prove but- what is RGB is Hero's dead parent? I mean, he said he was dead, and still he don't knows how he died... And if we have to notice, Hero only say goodbye to her mom, the way he slowly is getting more attached to Hero and the fact he doesn't remember his own past, may be could mean, they actually are related in one way or another...
Any way, I don't have a single prove of this beside the begging; and that would not explain why he got for other Heroes, and he would be so old to be a parent, it's much less probably, unless he was a grandparent. And even so, he has been in love with Mandras and Magnus (probably) so the only way they could have a son is that one of them was a real person before and they had a baby of adopted.
So don't take this so seriously, I was seeing a movie and I got sentimental for the final revelation xD