A "custom avatar" refers to a personalized or individualized digital representation of a person, often used in online platforms or video games. It means creating a unique character that represents you in a virtual world. Full definition
It isn't clear as to whether players will have the chance to create their own custom avatar or change an existing heroes appearance but we do know the option is in the game. (heavy.com)
You also get the Rule the school awards, including your unique custom avatar. (kickstarter.com)
This subscription, which cost $ 30 per year, allowed users to disable ads and create custom avatars, as well as other features. (beat.10ztalk.com)