So long as they don't also have a steadfast buff or their abilities say they can block
Generally, yes.
If the blocker has a Steadfast effect or an ability that specifically lets them block unblockable attacks, that will apply to their auto-block as well - most of those abilities only work with class advantage, but Arcade’s sig ability gives him steadfast…
so steadfast buff or champions like Wiccan or Kushala that list specifically in their kit for class specific abilities to block unblockable … RiRi, Solvarch etc those kind of specific descriptions in their kit.
so champions like Medusa with auto block can be completely bypassed with unblockable attacks from Adam Warlock or Dr. Bong etc?
This is correct
Yes, but if the opponent has steadfast, they can block the attack anyway.
Yes
