Saint graph

There is an option in the game settings that allows to toggle the final ascensions art on and off in the friend support display.

To change what you see, you go into My Room -> Game Settings and scroll down to Apply Ascension Settings to Supports and turning that off will make it so you never see final graphs. And as far as making it so your friends see something specific, you can go to Formation -> Spirit Origin List and then click on the servant you want to change and you can pick the cards, the selection icon, and the sprite used for that servant. I believe that also changes it for your friends as well but I'm not 100% sure.