2) Lung (or an OC with Lung's power) in MHA (We could decide that later with a poll). The MC will start with Lung's power, but I will add something or change a couple of things about his power to make him OP (That is how I roll, my MCs won't be weaklings).
4) SI OP Symbiote merges with Galatea in the Negative Zone and they also decide to go on a Multiverse trip when they end up coming out in some other world rather than DC. Though they would eventually find their way back to DC and the trip would contain worlds like MHA, Worm, MCU/Marvel, etc.
3) SI Kaguya Otsutsuki absorbs Madara's knowledge and experience when she takes over his body. After that, she obviously uses that knowledge and experience to beat the snot out of the Shinobi alliance before she finally decides to go on a Multiverse trip. Her trip would include worlds like MHA, Worm, DC, MCU/Marvel comics, etc.