As of the eight and final book, "Big Nate Blasts Off" was released, the book explained a lot more about Randy and even himself stating that he has horrible grades and his parents are getting divorced. These are probably what shaped his ego the wrong way.
In the end, Randy joins the 38th Annual Mud Bowl, and beat Jefferson Middle School, which in the end, Randy stated that he could live without Ruby in his life.
They got to know each other better over time. However, in the daily comic strip, the two remain bitter enemies.
Randy had to retake a year of preschool which means he's one year older than Nate.
During Nate and Francis Pope's bake sale, Randy shows up and steals one of the lemon squares. Nate notices, and asks Randy to pay up for it. Randy pretends he does not have it and throws it away. The lemon square lands on Ms. Godfrey's butt and she demands who threw it. Randy lies and says Nate did it. Mrs. Godfrey believes him and writes Nate a detention slip. Nate gets revenge by throwing his Dad's coconut yogurt pie (which he commented earlier that no one wanted to touch) at Randy, earning him five detentions, but Nate was satisfied at it whatsoever.
Quest to Defeat the Kuddle Kittens
School Beach Dance
When Nate and Dee Dee arrive at the Beach Party Dance, Randy teases them by yelling out that Nate and Dee Dee are the "hot new couple". Dee Dee retaliated by saying that Nate is just her friend, but that he would not know because he has no friends. Nate was surprised that Dee Dee actually stood up to Randy, as not many people have. When Nate is in the middle of changing his clothes for the dance, Randy steals them.
Fight against Nate
After Dee Dee slipped Nate's crush on Ruby secret out, Randy is shown in the library, not wanting to finish beating up Nate. He flung Nate's bag in the air, making stuff go everywhere. Dee Dee pointed out he's mad about who Nate loves (Ruby.) In the cafeteria, Nate got splashed by Root Beer, which was Randy's trick, not Ruby's.
Later, Nate wrote a new newspaper column, with Guess That Guy, and everyone know it was Randy. They had a BIG fight in the halls, and they had to have peer counselling with Gina. On a science trip to somewhere, Randy and Nate HAD to partner up. Suddenly, Nolan appeared, making fun of Nate as usual, then Randy came and stood up to Nolan.
Randy stated that he has horrible grades and his parents are getting divorced, which motives him. Later in the end, Randy joined the Mud Bowl, and they played against Jefferson. And after 37 years, P.S 38 WON!!! Randy and Nate both celebrated the victory, making them good friends. However, in the comics, they are still enemies.
Randy wears a T-shirt casually. In some books, his shirt is green but in color comics, his shirt is grey. On his shirt is a fruit which appears to have a crown on it. He wears long, grey pants and black shoes. In color comics, his pants are olive-green.
Randy Betancourt is mean, cruel, and snobby. He is also hotheaded. He is very revenge-seeking; this is most prevalent when he attempts to sought revenge on Nate several times after Nate humiliates him. He also picks on almost everybody in school.
After his redemption, Randy's personality underwent major changes. Now, in the novels he is now much nicer and no longer a bully. He still has a bit of attitude in him, as shown in Nate's comic strip where he yells at Chad for not catching the Frisbee because of his good throws, but now he is nicer to Nate and his friends. Although he does not seem to hang out with Nate, such as Chad and Dee Dee do. However, he is still a mean bully in the comics, and still remains a bully to this day.
Nate Wright is the class clown and one of Randy's worst enemies. Nate also believes he has no friends, stating that his posse only follows him out of fear. At one point, Nate used his messy locker to humiliate Randy, and Randy swore revenge. The latter achieved it by roughly stomping upon Nate's foot and rendering him unable to play for his team. Nate is also annoyed that Betancourt never receives detention, although he constantly does "detention-worthy" things.
After discovering the truth about him, however, Nate is more civil towards him. After the Mud Bowl, they even became friends and Randy found it easier to respect Ruby Dismore's (his crush's) decision to stick with Nate. However, in the daily comics, Nate and Randy are still bad enemies. Once Nate accidentally spilled his lunch on Randy, and Randy makes him meet at the soccer field after school. There, Randy tried to attack Nate, who ducked, and it resulted in Randy dislocating his arm, making their rivalry even more intense.
Randy Betancourt had a crush on Ruby Dinsmore, though Ruby does not feel the same way. In the end, Ruby chose Nate Wright and he waved her off.
Randy Betancourt has a posse of students that always follow him around. According to Nate, Randy sows fear within them to ensure their loyalty - they do not even like him. However, Nate's speculations were never confirmed to be true.
Randy picks on Gina too, but Gina still picked Randy on her team as a replacement to Nick Blonsky. Hemphill-Toms might have only picked Betancourt to get on Nate's nerve and plus, Randy is very athletic and proven when he throws a Frisbee an entire miles' distance.
Likes and Dislikes
His posse: Randy finds them very useful, having inspired fear to seek their loyalty to him.
Not getting payback: Randy very much dislikes it when he never gets to attain his revenge.
Behind the Scenes
He appears every once in a while in the comic strip, and in almost every Big Nate novel. He used to be a minor bully in the strip, but later on, he started to appear more.