Have to agree with Morden and say Runaways! They're honestly what got me into Marvel comics in the first place! The series could work quite well, as it would show somewhere in the MCU that wasn't New York. Sure there's the small issue of Molly being a mutant but that can be retconned with ease, much like Quicksilver and Scarlet Witch. And I mean, who wouldn't want to watch a bunch of teenagers running around with a dinosaur?

If not that, then Young Avengers would work nicely. Either with the original team, or the most recent. America Chavez needs to enter the MCU at one point!

As for DC, Buddy-cop Blue Beetle and Booster Gold would be fab!

Either than Nightwing, or if they wanted to go with something more dark, Midnighter.