Some characters in my campaign were involved in a magical experiment. Said experiment went wrong and the participants were all afflicted with (randomly determined) side effects. One of the participants was a wizard and as a result of the failed experiment, she is now permanently invisible. This only affects her body though, and not the clothes she wears or the things she holds.
If she undresses completely and leaves behind all her gear, she is completely invisible and therefore gains all the associated benefits. But most of the time, she wears clothes and carries around a backpack, an arcane focus and other adventuring gear like that. This whole predicament has led to some interesting scenes.
Every now and then, this character would like to speak face to face with people, which is difficult while having an invisible face. Different methods to solve this problem were discussed. One of the potential options is for her to cast disguise self. Ideally, she could use that spell to let her body temporarily “reappear” as an illusion. But I am not sure if that would work.
In order to avoid a discussion about this being based on a magical homebrew effects, let me reframe this question:
Person A is under the effect of a greater invisibility spell and completely naked. This spell was originally cast by Person B, so Person A cannot stop concentrating in order to end the effect. Person A is also in the middle of a heated battle and must warn her deaf comrades (who are too far away to reach them) from incoming danger. So Person A has to become visible somehow, but the only spell Person A has available is disguise self.
Can Person A become visible by casting disguise self, or would the illusion created by this spell be also invisible, because greater invisibility is a higher level illusion (affecting the same target)?