Sir Giggles

Sir Giggles is the second major character to appear in the Backroom. He appears as The Jolly Little Elf in Christmas Edition.

The Backroom
In the Backroom, Sir Giggles represents a clown, from the colorful design, to the "makeup" on the face, to the oversized boots. He also has two jester ears, one of which points upwards like a ram's horn. However, unlike the typical clown, Sir Giggles has rows of extra sharp teeth. Sir Giggles also strangely has hair sticking out from his head.

The Backroom: Christmas Edition
As the Jolly Little Elf, Sir Giggles is much more saturated, utilizing a brighter shade of red. The body and pants areas are now green, with the arms and limbs red. The big button of Sir Giggles' chest has been replaced by a giant bell, and he has a decorational element (can't figure out the name to it) on his torso.

The Backroom II: Retribution
Sir Giggles experiences drastic changes in Retribution, especially in the face. The eyes have been abandoned in favor of seeing through the cheeks, which are now bright blue as a result. In spite of this however, the eye sockets are larger than they were in the Backroom. Scratches appear all over Sir Giggles's design, and the hairs are no longer present. One of the jester's ears is also missing. The entire body has been de-saturated, with the exception of the lips, which are even more saturated than before. The colorful arms have long since fallen away, being replaced by grey wiring. Finally, Sir Giggles has a neck, a feature strangely not present previously.

Personality
Sir Giggles does not really have a clear personality in the Backroom and Christmas edition. However, in Retribution, Sir Giggles is shown to be the most violent of the characters, snapping the player's jaw in an effort to "make him smile". He is also shown to be psychotic and sadistic, showing abject glee at mutilating and torturing the player.

However, this could simply be role-playing

The Backroom
At "2AM", Sir Giggles becomes active, and starts booping his nose, which gets louder and louder with each progressive boop. To stop this, the player needs to press the down button to reduce the volume, because if Sir Giggles's nose gets too loud, he will get angry and jumpscare you.

The Backroom: Christmas Edition
Sir Giggles behaves the same in the Christmas edition as in the Backroom, with the main difference being that the volume of the nose goes up more slowly.

The Backroom: Retribution
In Retribution, Sir Giggles will occasionally start honking for a few seconds at a time. During this time, the player must spam the left arrowkey, failing to do so resulting in a jumpscare.

Trivia

 * Sir Giggles was originally going to be called Mr. Giggles. However, seeing that there was a character named Mr. Giggles in Bubba's Diner, it was decided that the name had to be changed.
 * Unlike the other characters in Retribution, Sir Giggles' eyes do not turn blue. Instead, the cheeks turn blue and the eyes disappear entirely.