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Say I have one tapped character without Brave, and one untapped character with Brave. My opponent has two untapped characters, one of which is Bumblebee - Legendary Warrior in Bot Mode. If my opponent flips Bumblebee to Alt Mode, will they be forced to choose Bumblebee as their attacker targeting the Brave character? Or, can they choose to attack with their other character, attacking the normal tapped target?

They do not have to attack with the Bumblebee. Brave is only relevant when choosing the target of your attack, not when choosing your attacker. If they do choose to attack with Bumblebee, they will need to choose the Brave target.
Source: Wizards of the Coast (2019-02-11)    【Link to Ruling】
Tags: Bumblebee, Legendary Warrior, Bumblebee, Legendary Warrior