Ghost of Christmas Past (TheGamerLover)

"My wand contains the light of truth, which can unmask any kind of lies, but let's get to the main point, shall we? I am here for your self-sake, Weiss Schnee."

- Ghost of Christmas Past

The Ghost of Christmas Past is one of the major characters in RU🅱️Y: A Christmas Carol, she is the ghost who shows Weiss Schnee her past and childhood. The angelic spirit shows Weiss scenes from her past that occurred on or around Christmas, in order to demonstrate to her the necessity of changing her ways.

Role
The Ghost of Christmas Past appears in Beacon Academy's Dining Hall and introduces herself to Weiss before travel 10 years (more or less) to the past, here, the spirit shows Weiss how she completely changed from a nice and innocent girl to a rebel, prideful, cold-tempered, confident and arrogant person who only thinks on herself.

Angered, Weiss orders the spirit to "leave her the fuck alone", with a confident smile, the spirit sends Weiss back to the Dining Hall as she says "Truth Lives".

Finally, the spirit is reunited with her brothers in Team RWBY's room smiling at Weiss after she redeems herself.

Trivia

 * Although she seems to be Rosalina, it is unknown if it's truly her or a woman who looks like her.