My headcanons are:

\- Michael is Lucifers older brother.

\- He is the opposite of Lucifer in everyway, whereas Lucifer is sweet but introverted, Michael is Extroverted but cruel & cunning.

\- When he is in public, he comes across as swath, cool, elegant, regal, and charming, but in private, he is cold, calculated, prideful, and arrogant. He is alot like Gus Fring from Breaking Bad and/or Tywin Lannister from Game of Thrones actually (in terms of personality).

\- He is the reason Adam is the way he is as he emotionally, mentally, psychologically, and physically abused Adam and used similar harsh methods that Adam and Lute used on the Exorcists when training them (whatever those are), meaning he also indirectly is the main source of Vaggi's suffering.

\- He secretly has Crimson & Striker under his payroll, and he has a Ninja Bodygaurd called the Elbow (a Parody of Marvel's The Hand), whom are neither Hell nor Heavenborn, but from a different pantheon entirely.

\- He gave the idea of the Exterminations to Adam, because he knew Sera would never listen to him, but she would listen to Adam. But Michael originally wanted to target Hellborns as well.

\- Whenever he was around, Adam's mood changed from...how he usually is, to basically a scared child stumbling over his words, trying to win his abusive father figures approval even when he knows he won't get it.

\- The reason he was absent up until now is because he was leading crusaders and Colonialist efforts against said other Pantheons, and without Sera's knowledge no less.

\- He returns upon hearing the Might of Lilith fiasco.

\- He uses Vaggi's bad history with heaven to his advantage, turning Vaggi against Sera....just as he turned Sera against thr Fallen Angel Carmilla years ago.

\- Also, he outs Carmilla as a Fallen Angel. He and Carmilla don't have the best history together as he turned Sera against her by convincing her Carmilla's fascination with the living world and weapons was dangerous, and Michael also disfigured Carmilla's arms and legs before having her banished/exiled (explaining her big arms and ballet legs). Him outing her parallels Adam and Lute outing Vaggi in S1.

\- Michael always hated both Lucifer and Sera. Viewing Lucifer as a pathetic joke and Sera as Weak and spineless.

\- He wants to take full control of Heaven for himself, and make it how HE thinks Heaven should be.

\- He is voiced by either Alfred Molina or JK Simmons.

\- He has a flaming sword.

\- He originally scolds Lute for not finishing off Vaggi when she had the chance.

\- Also he likes Chess.....and Candyland.

What are your headcanons for Michael, assuming he ever appears (Art One by Reminoaa and Art Two by Nocturnalraptor).