Why is Calca called Sudi?

Because Karsa named the plant Sudi in the live broadcast. Karsa didn't want to broadcast LOL when it was live, so she played Plants vs Zombies. However, during the game, Calca's brain suddenly opened wide and began to give names to various plants, among which the sunflower was named Sudi, and the fans also called Carl Sassudi when playing with stalks.