Toa could; talk Galactus into giving him the Power Cosmic, Thanos into giving him the Infinity Gauntlet (when he had it) , and The Watcher into being his personal body guard. Toa could convince Superman that kryptonite is good for him. Superman would believe it and take kryptonite as a vitamin supplement til he dies.
Blood lusted? Harvey cuts all the dialogue and goes straight for the jugular. Superboy Prime ends up like Superman did in these scans only worst and a lot quicker. Harvey fought the Justice League from two world's, aligned with New Earth's villains (Lex Luthor, Scare Crow, Black Manta, etc.), and took on all the armies of the world; all at the same time. If Superboy Prime is all that stands in Harvey's way. Prime loses to the man who's brain evolves at a rate of a century per hour.