This boss is auto friendly, but you need an energy battery, since most of his skills (active and passive) reduce your team’s EP.
Right now the best unit for this it’s going to be Shale. It’s worth investing in her not only for this boss but for general usage since green teams will use her for a long time.
Both characters provide damage immunity with their Blossom skill, so make sure you turn off auto only for them (you only need to use one, not both in the same team). You also have to time when to use the skill to have enough time to apply said immunity. Wait until the bar is almost done (around 5-10%) to proc your skill.
Reminder that this is my setup and all accounts are different, outside the mandatory units mentioned above, you can change compositions to fit your strongest characters. I’m running ATK SPD on both formation and S Trigger.
Rayhou plus Shale so I can just auto the boss and not worry too much about characters dying.