Replacing the default first-person character in Unreal Engine 5 can be done relatively quickly. Here's a basic overview of the steps:

Prepare Your New Character: Ensure your new first-person character is set up and ready to be imported into Unreal Engine 5. This might involve creating or obtaining a character model, animations, and any necessary textures or materials.

Import Your Character: In Unreal Engine 5, go to the Content Browser and import your character assets by either dragging them in or using the import function.

Set Up Character Blueprint: Create a new Blueprint based on the default first-person character Blueprint. You can do this by right-clicking in the Content Browser, selecting Blueprint Class, and choosing Pawn. Then, choose the First Person Character as the parent class.

Replace Mesh and Animations: In the Blueprint editor, find the components representing the default first-person character's mesh and animations. Replace these with your new character's mesh and animations.

Adjust Settings: Depending on your new character's size and animations, you may need to adjust settings such as collision, camera position, and movement parameters to ensure everything works correctly.

Test: Finally, test your new character in the game to ensure it behaves as expected. Make any necessary adjustments until you're satisfied with the result.

By following these steps, you should be able to replace the default first-person character in Unreal Engine 5 with your own character relatively quickly.