if a player does /disguise their chat will change in chat
COMMUNITY QUESTION
How to change player name in chat?
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you can create a custom chat where you can with a value see if they are disguised and then give them a random name instead of theirs
https://devforum.roblox.com/t/changing-chat-type-and-other-chat-settings-without-forking/313614 This should be of use to you.