Come on bruh. We all love Batman here. But without him his universe becomes a lot less interesting. Especially if it's gonna be entire seasons worth of television.
Plus as a Batman fan the idea for the show just sounds ridiculous to me. The notion that all of these characters destinies were intertwined from the start long before the arrival of Batman just doesn't sound plausible to me and any attempt to make it work is gonna come off forced and contrived.
I always understood that it was BATMAN that brought these people together.
I'm sorry I hate to say it and I know it's cliche and I know you're not gonna wanna hear it but it really couldn't be any simpler. You don't make a Batman show without Batman.
Season 2, Bruce meets Joker in high school, starting a rivalry that will last a lifetime