I am imagining American universities and American high school scenarios here, as I am American :)

(what he WILL be like in high school)

-He will try out for the football team and make it

-All the cheerleaders love him and want to go out with him; heck, all the girls want to

-He's basically the most popular guy at school, but nice to everyone, has friends in all sorts of social groups

-He's not that academically smart, but squeaks by with OK grades

-He will attract top college recruiting attention and end up going to Alabama on full athletic scholarship and win a Heisman

(what he WILL be like, too!)

-He's that super-cool guy in your chemistry class who doesn't say very much

-Just sits in the back of the room looking bored the whole time

-Everyone has a crush on him, but most are too intimidated to let him know

-Will be voted best-dressed at the end of the year

-You can find him after school skateboarding around the parking lot

-He's very smart under that chill exterior and goes to MIT to study engineering

-He is serious and doesn't joke around, but popular with most groups

-He gets excellent grades and always has the right answer when a teacher calls on him

-Is always willing to go over schoolwork or notes with friends who need help

-Sometimes skips lunch to study in the library

-All the girls are crazy about him, everyone is betting on who he will ask out first, but he says he doesn't have time to go on dates

-Voted "Most Likely to Succeed"

-He goes to Stanford to study computer science

-He is the class clown

-He has a smart mouth and sasses the teachers, but gets away with it most times because he's actually really funny 

-Always knows where the parties are each weekend

-Attends all the games and dances, he loves all that stuff

-If you're on a sports team and he's your friend, he will show up at your meets and embarrass you by screaming and cheering

-Gets into fights in the halls sometimes with other kids due to his temper

-His grades are excellent across the board

-He goes to Harvard, and then on to medical school!

-He's the weird theater/drama kid

-Gets the lead role in the school play every year

-Dresses outrageously

-Always in trouble with the principal for breaking dress code, dying his hair crazy colors, and wearing extreme makeup

-He's also good at sports and is on the wrestling team

-He fakes his way into USC, Lori Loughlin-style, by using Texture Surprise to falsify his test scores. Nobody knows how he has enough Jenny to afford the tuition

-He had shorter hair when he was in high school

-They didn't allow him to have his hair that long back then

-He's a quiet type in class like Killua

-Doesn't have any friends, eats lunch alone, is aloof to everyone

-Is very methodical about schoolwork and homework

-Not on any sports teams, doesn't do music or drama, not a member of any club

-Nobody knows what to make of him

-He applies to every one of the Ivies, gets into them all, and settles on Dartmouth because he likes the university's colors

-He is that super-hot guy at school who has the reputation of being a player

-Isn't involved in sports 

-He likes speech and debate, though, and participates in that

-At lunch you can usually find him off in a corner reading a book

-He's not unfriendly, just prefers reading to socializing most of the time

-Gets voted Homecoming King

-Gets voted "Best Looking" 

-Goes to NYU to study art and film

-Everyone refers to him as the goth/emo kid on campus

-Wears all black

-Uses his broken English as a method of avoidance if he doesn't feel like dealing with you socially

-He's actually on the school tennis team, it helps him with his reflex training

-The coach won't let him wear a black shirt and shorts, though, so he has to wear the regular uniform, much to his annoyance

-Teachers are perplexed by him and always trying to get him to speak up in class

-He goes to the University of Texas because he likes the slogan "Keep Austin Weird"

-He ends up developing a taste for country music, much to his surprise

-He's the guy that everyone wants to pal around with

-Always has a crowd around him at lunchtime

-Gets in trouble for texting in class

-He probably would have gotten Homecoming King, but Chrollo is simply too hot and won more votes

-Has tried a few different sports

-Tried band, but didn't like it much so he quit

-Gets voted "Best All-Around"

-He goes to the University of Michigan on scholarship to study business administration, but ends up having to watch his grades because he parties too much