From comics to live action to video games etc., how many established multiverses are there? For example, Arrowverse multiverse, Final Crisis Online game 52 multiverse etc. Also, which continuities are part of the same multiverse and which ones are self contained? For example, Batman 89, 66, DCAU, Super Friends etc. appeared as members of the Batmen of the Multiverse in Brave and the Bold. Is this canon?