Elden Ring Nightreign does not feature the same degree of character customization as other games developed by FromSoftware or other multiplayer-focused games, but this doesn’t mean that it’s not possible to change your Nightfarer’s appearance. During your war against the Night in Limveld, you can unlock different skins for all characters, allowing you to alter their appearance and make each Nightfarer feel more like your own.
Changing skins, or Garbs, in Elden Ring Nightreign is really easy, and does not require performing any complicated operation or getting to a hard-to-reach location. To change the appearance of any Nightfarer, open the Roundtable Hold main menu, and select Change Garb to get transported instantly to the mirror inside the main hub that allows changing skins.

At the beginning of your adventure in Elden Ring Nightreign, the only available skin will be the one representing the Nightfarers’ vanilla appearance, but more can be unlocked by playing the game and completing Remembrance episodes, the personal quests of each Nightfarer which provides additional details on their story, and how they ended up in Roundtable Hold to fight the war against the Nightlords. You will also need Murk, the only in-game currency, to unlock them, but the currency is pretty easy to come by, as you are rewarded with a minimal amount even for Expeditions, so if you play the game enough, you won’t have any trouble unlocking additional skins with little difficulty.