This tag is used for works where the creator of said works have used themselves as a source.
Some creators have made source videos (also known as autosources) of themselves where they make noises with the intent for them to be sourced in YTPMVs or 音MADs. The creator may film themself making the sounds, or have them placed over an image or animation of some kind. It is not uncommon for creators to not want to show their face, and so they will place a picture, blur effect, or other form of censor over it. Some authors also source videos of themselves that were not originally intended to be autosources.
Only use this tag for works where the creator had used their own source. Other creators who have used their source does not count.