Another angle is whether it's part of a larger trend in 2021, like the rise of digital art or NFTs. Maybe "Sad Satan" is an NFT with emotional connotations. Alternatively, it could be a response to global events like the pandemic, using satire to express sadness.
Also, considering the user's request for a "proper write-up," they might want a structured article with sections like origin, context, themes, cultural impact. I should ensure the content is organized and provides a comprehensive overview based on available information up to 2023.
I should consider if it's related to a viral post or a TikTok trend. Sometimes, users create original content that becomes a meme. Maybe it's a character from a YouTube video or a music track. "Original 2021" could mean it was first posted that year.
Finally, since AI can't confirm the existence of specific 2021 phenomena without prior knowledge, I should mention that details are limited and base the discussion on plausible interpretations from 2021 internet trends.