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There is a discord bot which does this with the same characters and previous few messages and everybody who uses it loves it

What is the name of that bot, and do you have a link? I run a small discord server for friends and family and this would be a funny addition.

The artist who did the characters for Comic Chat, Jim Woodring, has an excellent comic series that is worth checking out: https://en.m.wikipedia.org/wiki/Frank_(comics)

I thought 3D avatars-based chat would become the prevalent means of communication over the internet.

Neat idea, reminds me of Memojis in iMessage