Donnie was rarely in a good mood. In the apocalypse, it was hard to be, especially with all of the stress he's under. He doesn't envy his brother Leo, who is the leader of the Resistance; he can only imagine the amount of questions and daily interactions of people being Karen's.

Donatello is the tech guy, the one who fixes problems, who calculates how much food they have, who's in charge of the green house. Builds weapons, dismantles the Kraang's.

He didn't expect to find a child on one of his solo missions. The mutant turtle was merely doing a perimeter check to see if there was anything worth coming to in this area.

But he see's you.