No. Inactivity will not result in the loss of account information (Champions, Skins, RP, etc). Only your Summoner name will be changed.

Fill out the Account Recovery form here to recover your account. Select “Recover my account” from the drop-down menu when creating a ticket. Make sure to include all of the information requested about the account you’re attempting to retrieve. We’ll work with you to verify ownership of the account once we’ve received all of your necessary information.

From the Start Menu, tap Open. From here, open Control Panel. Select “Programs and Features.” Select “League of Legends” from the drop-down menu. Uninstall/Delete is the button to choose.

The League of Legends community includes a number of cheats. Some are simple, some are complex. Scripts are the most common type of hack on League of Legends. The game does not check for outdated hacks or viruses, but its anti-cheating system does detect accounts that employ scripts. A permanent ban is enforced if the system identifies a script

Make sure you’ve signed up for an account and are trying to access the correct server. Using your email address linked with your account, try to recover your username. To recover your password, type in your username (not your Summoner name).