Playing Against Shadows

I’ve been learning Hisako a little bit. I’d like to just play other people’s Shadow’s for a while, but there is no way to do that without playing as your own Shadow is there? I discovered this a while ago, but I just wanted to post to make sure I’m not missing anything. My Shadows are Arbiter & Tusk. I can’t just take Hisako (for whom I don’t have a Shadow) and select Shadows of various characters to play at my discretion? I know there is Shadow Survival. But I really like playing the Shadow’s and I would like to play the match-ups I want.