RWQFSFASXC

RWQFSFASXC, also known as RXQ or simply Shadow Bonnie, is a shadowy version of Toy Bonnie.

History
Shadow Bonnie rarely appears in the office in Five Nights at Freddy's 2, in which the player must put on the Freddy Fazbear Head to prevent him from crashing the game (or freezing it in the mobile version).

In Five Nights at Freddy's 3

While Shadow Bonnie himself doesn't appear in Five Nights at Freddy's 4, SpringBonnie casts a purple shadow which is strikingly similar to his appearance in the FNaF3 minigames, some people believe this is a hint to Shadow Bonnie being the victim of a springlock failure.

In Ultimate Custom Night, he's one of the characters who can be summoned by Dee Dee or XOR. He causes the office to become pitch black for about 10 seconds. There's no way to avoid him.