The G-Meister
Giga Slime
There are a few instances in arcade mode where you can get enemies that attempt to attack you, dealing no damage. Fortunately, this is not game breaking as it can only occur after a room has been completed. Yes, normally all enemies have to be defeated for most rooms to be considered as "complete", but in a few instances such as challenge and boss rooms, enemies are not killed at the end. In all instances, if you leave and re-enter the room, the enemy will disappear.
Example 1: The passive Bloomo
Although not as passive as the one in Arcaida, this one can be done by herding all the chickens in the challenge room on floor 2 without killing the Bloomoes. I had to kill one here, but the other is still fine, attempting to hit me - to no avail.
Example 2: The passive Jumpkin
This is done by killing the Pumpking while one of his Jumpkins is spawning. The result is similar to the one above, but this guy can push you around the room as well.
Example 1: The passive Bloomo
Although not as passive as the one in Arcaida, this one can be done by herding all the chickens in the challenge room on floor 2 without killing the Bloomoes. I had to kill one here, but the other is still fine, attempting to hit me - to no avail.
Example 2: The passive Jumpkin
This is done by killing the Pumpking while one of his Jumpkins is spawning. The result is similar to the one above, but this guy can push you around the room as well.