Well, Arle had a good run but I think it's time we all face reality. As of today, April 1st, this is now the Draco Centauros thread.
"You can't compete with me!"
Draco Centauros, born August 2, is a half-human, half-dragon martial artist who straddles the line between hero and villain in the Puyo Puyo multiverse. While most often she is a side character, Draco has served as protagonist of several stories in the Puyo canon. A tomboy with a streak of vanity, Draco's first appearance depicted her as a dungeon lackey willing to attack children, and over the course of the franchise her nuanced character development has seen her become one of the most well-accomplished individuals in the series.
For Draco, Puyo matches are a necessary distraction due to the obsession of the world around her. She has not bothered to master basic rules of the game such as rotating puyos. Getting them done and over with is a means to an end in spite of whoever is the victor; a way to suss vital information out of Arle, ensure she can enjoy a relaxing vacation or calm psychotic forest creatures. Instead of devoting her life to a game proven again and again to destroy the fabric of reality, Draco has focused on self-improvement. Her talents at physical combat are considerable even if they don't lend themselves to popping Puyos, meaning that Draco has been constantly honing her skills by beating up people offscreen while Arle has been playing connect four with slimes. Her hobby is entering beauty contests, and will go to great lengths at great personal risk to obtain legendary swimsuits for the slightest bit of a competitive edge. However, Draco is not all brawn and beauty. Her drive to go further has taken her to the farthest reaches of outer space, just on a whim, and while she may have run into Arle on this adventure (who, typically, got there second and only because something something Tetris), what she really found was herself.
Of course, being adept at physical combat makes her an excellent choice for Smash. She can unleash flurries of punches, roundhouse kicks and whip with her tail. Her wings can provide a hover mechanic, and of course being part-Dragon, she has several ranged fire attacks with a variety of firepower at her disposal. Perhaps even her horns can be utilized in a headbutt. Her aggressive, go-get-'em attitude, alternative hairstyle and stylish dress sense means that she will appeal to various cultures all over the world. Also, dragon person is basically Ridley so she might make those people happy too.
In short, while I apologize for such short notice, I hope you appreciate that Draco is the better choice over Arle and her dinky little not-Pikachu