* To connect with a younger audience: The films and animated series are targeted at a wide range of ages, and a young, inexperienced Autobot like Bumblebee talking in a limited, broken manner helps him feel more relatable and approachable to kids.
* To create a unique character: Bumblebee's speech is a defining characteristic, making him stand out from other Autobots who can speak fluently. It adds to his underdog charm and creates a sense of mystery surrounding his past.
* To reflect his damaged vocalizer: While not always stated explicitly, it's generally understood that Bumblebee's limited vocabulary and speech patterns stem from damage to his vocalizer. This injury could have been sustained during the war on Cybertron, contributing to his backstory and making him an even more sympathetic character.
* To enhance his communication with humans: Bumblebee's limited speech allows him to communicate with humans in a way that is both playful and reassuring. It also creates a need for him to find creative ways to express himself, often relying on physical gestures, technology, and Sam Witwicky's understanding.
* To provide comedic relief: Bumblebee's speech patterns are often humorous, adding an element of lightheartedness to a franchise that can be quite action-packed and serious.
In the latest Transformers films, Bumblebee's speech has evolved, becoming more fluent and sophisticated. However, he still retains some of his signature traits, ensuring that he remains a beloved and recognizable character.