In games like PUBG, players may encounter situations where they need to switch perspectives. For example, when switching from first-person perspective to third-person perspective, pressing the "pubg key" enables an easy transition. If players attempt to switch viewpoints during other game modes, the "pubg key" will remain in its default input mode switching mode.
If players wish to use different characters in the game, they can enter new usernames to unlock them, which typically involves the game's character unlocking system or purchasing new characters through in-game purchases. Players can also upgrade existing characters by adding new ones or upgrading their current characters to acquire new abilities and weapons, which often requires the purchase of real-world currency or in-game money. Please note that the information provided is based on the original content provided, and it aims to make the description more accurate and complete, with any further questions about "PUBG" or other games welcome.