This Comic's Cast:

Really, if you think about it, it makes sense for Shredder to enact laws dealing with Turtles. He clearly knows he's in the past (although, really, I don't think it'd take a genius to figure that out after a few minutes of walking), so why not make his life in the future easier, potential paradoxes be damned!
The two advisers are from "Chrono Trigger", FYI, although here they're different characters than in that game. I tend to have to do that a lot in the comic. I have to evaluate what characters I can reuse from other games and respect their back story, and what character I can reuse without worrying about it because they're generic enough to not matter.
In this case, I plainly went with the later.
 
    

When evil spreads across the land, and darkness rises and the monsters roam. When the creatures of the night make beautiful music, and the things that go bump in the night go bump with greater enthusiasm. When the world is in peril and is in need of a hero...

These guys are, sadly, the best the world can hope for. These are the adventures of the heroes of CVRPG. They mean well, they try hard, and occasionally they do the impossible...

They actually do something heroic.