I'm not gonna lie, I see a few good choices Danny Phantom, Dialga, Bumble Bee, Ultra Man (Japanese version not DC) but I'm having a hard time making out the rest. Can you give us a complete list before I give my final answer please
@Alex8784 Eh Actually It's Ultraman Nexus, and I have seen Ultraman Nexus like 30 times the episodes are great the fight scenes and the monsters are cool so are the mode changes
Still you have a good few choices. Danny Phantom is one of them because according to Omnitrix logic most Aliens grow stronger with age like 4 Arms and XLR8. Plus Danny after his trip to the future is stronger than his Dark Danny half already, so maybe if you're already 25 then you'll have all Danny's powers including DD but at DD level and control.