I have a HC about older bending brothers !!! Bolin will eventually join the army again, the united forces, and climbs up the ranks there while Mako stays in RC as an officer and climbs up the ranks in RCPD. At one point, they are captains in their own work field. So when Bo are in RC or they are meeting up; Bo greets him (kind of jokingly) with a 'Hey captain' and does a mock salute and Mako smiles and ruffles his hair (despite bo's weak protests) and gives him a 'hey captain' back. I am in love
This is a beautiful headcanon. I love it. It’s like Toph and Lin’s “Hey Chief.” Excellent! Cheers!









