Best Belle guide

Belle's Super can be incredibly powerful on Special Events such as Boss Fight, Super City Rampage, or Big Game, as it highly increases your whole party's damage against the Boss.
Always take advantage of grouped-up enemies, boxes, or spawns. Belle can also use her Nest Egg Gadget to keep enemies close enough for her attack to bounce more.
The boosted damage on enemies hit by Belle's Super makes her an ideal counter to tanks. The damage boost allows her teammates and her to deal enough damage to eliminate tanks. This also works to get rid of Brawlers with a very high amount of Power Cubes in Showdown, who can prove challenging to defeat in the later stages of the game where she is limited by poison clouds to maintain her distance from enemies. However, you must maintain your distance from tanks as much as you can due to their superior health and close-ranged damage.
Like Piper, Belle's low health means that getting close to enemies is not a viable option. However, unlike Piper, who has her Super to escape from close-ranged Brawlers if it's charged up, Belle doesn't have much to defend herself at close range, so she's vulnerable to heavyweights or assassins. If you're running away from such a Brawler, you can lay your Nest Egg Gadget behind you to deter them from reaching you, as disarming the Gadget is not possible without getting slowed. Additionally, if you have her Super charged, you can fire her Super onto the enemy so they receive more damage, and with her Grounded Star Power, momentarily disarms them. If you don't have her Nest Egg Gadget or your Super charged up, try to predict where the heavyweight or assassin will go, and stay mobile to ensure they can't reach you.
Belle has one of the longest consistent ranges in the game. You can use this to keep your distance and poke at Brawlers. Because of the bouncing, enemies are forced to separate, and you and/or your team can trap and defeat them individually, leading the enemies into an uncomfortable situation and position. Her passive chaining bolts and their bounces force enemies to distance themselves, making them vulnerable to assassins who can pick them off individually. This allows her to combo well with assassin Brawlers like Edgar, Fang, Mico, Leon, or Cordelius.