Just hear me out.
A-60 is in the game, and I'm proposing he is added to the damage runs. Here's how you do it.
Need: 2x Lockpicks Skeleton key
A few rooms after door 50, there is one room with a hidden entrance, but the hidden entrance is locked. Go to the next room and find the switch and head back to the room with the hidden area. Find the room and use the 2 lockpicks and the skeleton key. After that, you will be shown the ending screen, asking to continue the run. Saying yes will transport you to a recreation of the game "Rooms", the game Doors was inspired by. Go through the rooms and eventually A-60 should appear and kill you.
Please, mods, give some time to consider this. I'm telling you how to do this, this isn't fake. I'll post a video of how to do it as soon as possible.
Please don't ban me, I'm telling the truth.
(Edit): There's also A-90, but I'm not sure how he works