If you're talking about a digital representation of a user, like in a video game or online forum:
* Online persona: This emphasizes the constructed nature of the avatar.
* Profile picture: This is a more general term that refers to any image used to represent a user.
* Username: This refers to the text-based identifier associated with the avatar.
* Virtual self: This emphasizes the user's connection to the avatar.
If you're talking about a spiritual concept of an incarnation or embodiment of a deity:
* Incarnation: This refers to the act of becoming physically embodied.
* Manifestation: This refers to the act of appearing or becoming visible.
* Embodiment: This refers to the act of giving physical form to something.
If you're talking about a fictional character who represents something larger than themselves:
* Symbol: This refers to something that stands for or represents something else.
* Archetype: This refers to a universal pattern or model of behavior.
* Persona: This refers to a mask or public image adopted by someone.
It's important to consider the context of the word "avatar" to determine the most appropriate synonym.