It's rather sweet that a bunch of convicts would take in and raise a baby. While Megamind's criminal parents might not have been as pleasant as Metro Man's rich parents, it's notable that both aliens came to this world and almost immediately found a family.
A hidden Metro Man's So Proud of You to Mega Mind, though the latter never hears it.
Minion, posing as the Warden accepting Megamind's apology.
When Roxanne hugs Megamind disguised as Bernard. His reaction strongly suggests that he'd never been hugged before.
Well, she kind of had to touch the watch, so they could move past everything and get to a real place in their relationship. Which is pretty heartwarming, in and of itself.
"It's too bad you and I didn't go to the same school."
Roxanne running to Megamind's side after he's attacked by Titan. Even though it's actually Minion, it's so sweet.
"You were right Roxy. I never should have left."
"I did look back!"
"You did? You did?" Just look at the expression of pure joy on his face. Look at it.
When, towards the end, Roxanne switches the holographic watch off so that 'Metro Man' turns back into Megamind. The looks they exchange speak volumes.
Several times, Megamind performs impressive linguistic feats to avoid apologising or admitting he's ever been wrong about anything. Then Minion, disguised as the warden, calls him out after he hides from the world in jail...
Megamind: You want to hear it? Here it is; from the blackest part of my heart: I! Am! Sorry!
"You know...you look really good in white."
Final scene: Roxanne jumps into Megamind's arms and kisses him on the cheek. Megamind's expression is that of pure joy!
That whole finale altogether, that Megamind is finally admired by the people of Metro City for his heroism.
Mayor: Ladies and gentlemen, Megamind, defender of Metro City!
Megamind: (voiceover) You know...I like the sound of that.
When Megamind and Minion are breaking out of prison one last time to go confront Titan, they pass the warden, who had been left tied to a chair by Minion, and he calls to them "Good luck, fellas!" It's such a sweet moment, because, let's face it, the warden was the closest thing Megamind ever had to a father.
Megamind reappears and reminds Tighten the difference between a villain and a supervillain, during which Tighten is temporarily sidelined. Megamind rescues Roxy, and her first words to him are I knew you'd come back!. And she did, even if he didn't.
It's easy to miss, but in the "Button of Doom" short, Megamind has a recording of Metro Man's song in his lair.