How do I make a Character Customization GUI That...?

So I'm making a Character Customization GUI and I was wondering how World Zero did their customization?

So when you go to create a new character or select an old character it shows you the Character standing on a spot in front of your screen.

I was wondering if they had multiple spots in their server where players can look at their characters or if they found a way to make it where you Only see your character and not everyone elses characters being customized.

So instead of multiple spots, everyone's camera is looking at the same spot but everyone is seeing a different character.

Is there a feature that allows you to do this?

I know that local player guis can only be seen by the player. But how can the character they are customizing only be seen by the player?

I hope this made sense.