EDIT 1/6/2021: Updating formerly Starshade’s (now Flash’s) bio in light of the recent change I made.
 
Here are the rival Buckball Champions.
 
The show alluded to the fact that Buckball has grown into a national sensation. I like to think it’s grown into something on the level of American football, which is the obvious analogy in the show. I think there is a lot of financial investment in the sport, and as such, even high school/college level Buckball teams are highly sophisticated. As Twilight’s School is not really all that sport-oriented, their school does not receive as much funding as others, which means Halien has to pull his weight a bit as Buckball captain.
 
Flash  
-chaotic neutral; extrovert  
-Captain of the Thunderwings at the Cloudsdale Flight School  
-a jock with a lot of bulk and attitude to spare; he knows he’s the top dog in the business  
-slated to be the next greatest Wonderbolt in his father Wind Rider’s hoofsteps  
-thinks Rainbow Dash is a hack that earned Spitfire’s favor  
-rival Buckball champion to the School of Freindship; elite member of Canterlot Flight School  
-a good Buckball captain that strategizes well  
-son of Wind Rider and much, much younger Diamond Rose.  
-largely unknown in personality beyond his Buckball status  
-kind of terrifying  
-likes to paint surreal paintings in his free time, but has little respect for artists and frou-frou stuff like that
 
Halien  
-lawful neutral; extrovert  
-Captain of the Windigos at the School of Friendship  
-a good ol boy trying to make it big  
-a jock with a heart of gold and faith in his underdog team  
-hybrid son of Gilda and Dumbell; has a younger sister Cherry Bomb who is practically his opposite  
-loves deeply, almost carelessly  
-easily caught up in the sport  
-very competitive, sometimes distracted  
-loves peanut butter sandwiches to an unhealthy degree  
-buff af, definitely the hot darling of Twilight’s School of Friendship  
-devotes himself entirely to the sport and helping his team  
-hates Larkspur with a passion  
-when he gets flustered, his feathers fluff up real good