Responses
Three brothers, the third brother there is the exact one you're looking for.
Closest one I've read that mathes your description is the ML for Rumspringa mo Joukei (he's not sporty, but still fit). BL
I enjoyed My Guildmate Next Door, and the ML ticks most of your boxes, but he's not outgoing, rather awkward and really, *really* dense in a endearing way (also BL).
checking these out now thanks guys
manga recs with those outgoing, dense, sporty mls? theyre so my type