Hey I struggle to see certain colours and I chat in people's streams alot. It would be awsome of there was a option to change people's name colour so I can see who I'm talking too as I can't find a option :)
When it comes to seeing people’s names in chat have you tried our ‘readable colors’ setting for chat? It’s located under chat settings > chat appearance > readable colors should be toggle-able. We implemented that so colors in chat would be more accessible for users.
You can find more information about chat here: https://help.twitch.tv/s/article/chat-basics