Mephistos The Merman

All of land and sea, space and time, are in the scope of this time-traveler extraordinaire! Following in the footsteps of his great-great-great-great grandfather (and also great-great-great-great-great grandson) Timothy Timebuster, this trans-temporal adventurer is no sea-chicken! He's wrestled with megladons, plesiosauri, and e.e. cummings, he's hunted wooly mammoths from from an ice-hole, he's done more than you can possibly imagine (or know, what with shifting timelines and the like.) Laws of time have nothing on him, nor do historical mysteries. He's seen the fall of Atlantis multiple times, heck, he even caused it once! You thought that the mutiny befell the Marie Celeste? Well, you didn't factor in the fact that its captain thought himself above giving a lift to a passing merman. Indeed, you don't want to tussle with Mephistos, not with his slew of genetically engineered killer-lungfish and his kronon particle-firing flintlock, handily embedded in his tail!