Sure! Here's a simple implementation of the Flappy Bird game using Dragon Ball characters. Please note that creating a fully-functional game in a single HTML file might not be feasible due to code size limitations. However, I have provided a basic version that you can build upon.
You can improve the game by adding more Dragon Ball characters, adding scoring, and enhancing the graphics if desired. Remember to replace the `gokuImg` and `cellImg` variables with actual images or better pictograms to customize the appearance of the characters.