He markets himself as a protector but his design sense doesn't work for him...
I know he wants to showcase being a high defense hero by not taking damage while forgoing armor, but going for leather vest with a hood just looks weird for a tank. At least have bracers to fill the empty space. (Actually, did they use all their budget for the sister's outfit?)
He should've gone for a minimalist tight cloth shirt to emphasize his slightly lean build or even go full shirtless with some belts and stuff, to show off an unscarred tank.
He could even go Achilles style and wear a shiny metal chest plate, one that looks adamantine would be fitting.
Sister already looks out of place with her outfit, why not have all the members look more out-there instead of just have one prince-esque hero.
Also, his acting is subpar. He should be going all out in his stern but protective older brother role, but he's just acting like a basic cranky leader.
Basic call outs like "stand behind me" or something, would always put you center stage even for just a single scene. Especially if you're specifically saying it to the main star who is almost always on the spotlight.
Tbf, he knows that the sister has more potential and he wants to get some action as well by being the "protector" and "brother." But he doesn't have a shield so he isn't even committed to the bit.