Custom Thumbnails Add Custom Thumbnails, So everyone will Upload Custom Thumbnails

Thumbnails! Thumbnails can really be the main attention grabber for a video. I think alot of people can agree that custom thumbnails are essential.

Fonts It would be great, that we could change the fonts of our channels. Fonts like Comic Sans, arial... etc

sorry the bad english xd

Change user names I think we should have something where people can change their user names, but won't be able to change their names into other people's names.

Dark mode An official, working dark mode fully compatible with the whole site would be real nice. It could be in a little form of a light switch on the homepage or it could be in the main settings.