This I came up with after seeing some Fullmetal Alchemist: Brotherhood. Brawlmon's personality involves a few things. First, calling his partner "Brother" and treating them like a family member and Second, getting ticked everytime someone calls him little (Thats why he gets in a lot of fights, hence the name Brawlmon). I thought this would fit well with the following scene shown here.
Credits to everything shown.
Sol and Brawlmon belong to me
Digimon belongs to Akiyoshi Hongo and Bandai.