Yeahp, I'm well aware. Went a little overboard, but frankly...
Griswold is pretty weak compared to my other characters.
It's kinda a habit of mine to accidentally make really op characters, and the only thing keeping me in check was the rules of the RP game I used to play, and now that I don't play it... Well yeah. But I'm used to down-scaling my characters too because of that, so I'll probably figure something else. Or I could do as I said, and just do odd jobs that really isn't fitting someone of Griswold's strength.
Well, it's up to you to play characters that you enjoy playing! OP characters are fine if that's what you enjoy and that's the type of story that you want to tell.
There are definitely limits on what your character is practically able to do though (which can make things difficult in some ways). The only two rules in this game are (A) don't break the setting, and (B) don't break other player's stories. Spawning a god-tier Leviathan in Sky Harbor (just to fight it) has a high chance of impacting other player's stories, so you'll have to be very careful about introducing elements that could break or introduce inconsistencies to existing stories.
It's often recommended to write things that are much smaller in scale. Not all the players are reading everyone else's stories, so writing things that don't affect other player's stories is often the safest thing.
Finally, it's important to keep in mind that canon is established by majority rule. If one player comes along and writes that "Scribel City exploded and everyone died" -- but many of the other player's disagree with that and continue writing Scribel City like normal, the minority plot ends up as non-canon.