Compare with Woody:>1
Starts out as the most popular toy but is upstaged by Buzz. Because he's a jerk, Woody schemes to have Buzz taken out, which backfires when the other toys find out and force him out of the house as well. After repeatedly butting heads, he and Buzz are forced to work together to get back home, and they become friends. Woody gains some humility and becomes less of a jerk.>2
Woody's arm is ripped, making him insecure about his own mortality. Woody is kidnapped by an autistic toy collector and learns that he was actually part of a whole collection of toys based on a children's show. He has to choose between becoming part of a museum exhibit in which he would be well cared for and adored by many, or staying with Andy and being loved for a few more years until Andy grows older. Woody sacrifices his chance at immortality because of his love and devotion to Andy.>3
Andy finally grows up. Woody accepts that he has to move on from Andy and becomes Bonnie's toy instead.>4
Woody is dissatisfied with his life with Bonnie and is increasingly world-weary. He becomes protective of a newly born toy, Forky, who is captured by Gabby Gabby. Woody also meets up with his former love Bo Peep, who has no owner. Woody is sympathetic to Gabby Gabby's wish to be repaired and loved by a child so he gives her his voice box. Woody decides to stay with Bo Peep and be a free toy, saying farewell to Buzz, Jessie, and the rest of the toys.
Woody becomes less of a jerk and gains some humility, then he learns more about his roots, then he moves on from Andy, then he becomes fully independent. Buzz is the same character from the end of 1 all the way to 4, the vast vast majority of his development happened in the first movie.