Are unbanbarable in minecraft E.g. By color codes?

I have the following question: is it possible to become unbanbar in minecraft e.g. By color codes in the name. Garkolym used something like this in one of his videos.

No, at least not without some (broken) plugins.

No definitely not. Know about things like that. Don't think that it will do anything but you can try it out on a server that you don't use anyway

No, the server on which he did this was not configured correctly.