Had an idea for a Sentinel/Guide Hazbin Hotel AU!
I love the idea of Guides being seen as delicate and kind and incapable of violence....and then here comes Alastor with a steel chair using his abilities to seek out those dregs of society (rapists, bigots, etc) and pacify them to lure them out to kill!
No one ever suspected him due to this prejudice, but he didn't like how often he would be expected to help soothe things, or how forceful sentinels could be while still being very proud of his abilities, so in the afterlife he sets about making sure he is feared. Ironically, he thinks he is very obvious about his guide status, but literally no one knows about it.
As an angel, Lucifer naturally has more senses than just the five that humans have, and all of them are enhanced. Lilith isn't a guide, but she did try to help Lucifer. It didn't work, and while Lucifer tried to get along without a guide resentment built up in Lilith that she wasn't enough for Lucifer (in her eyes). This led to the divorce, which Lucifer has only barely started to accept.
When Lucifer shows up at the hotel, Alastor and him feel drawn together right away. I'm going with the "soulmate" option of having a perfect match, and Alastor and Lucifer are one such pairing, shown by how Alastor after falling into Hell actually gained a few new senses, such as the ability to detect and understand all radio waves! This means he can actually help guide more of Lucifer's senses, unlike a typical human guide. And due to Alastor's...crazy nature lol, with enough time he'll be able to use all of the senses Lucifer has, though not to the ability of an angelic sentinel, just the normal amount.
Alastor, fearing being forced into a role he never wanted, and Lucifer, not wanting to "betray" Lilith, immediately fight back against the pull. Lucifer is so desperate to not focus on Alastor, that he doesn't realize Alastor was hurt after the battle.
Alastor on the other hand, takes great pride in his abilities, and it would hurt his pride to allow any sentinel around him to fall into a zone, so he frequently helps Lucifer out, although Lucifer doesn't realize it (deliberate ignorance). In fact, the day Alastor quit, not only had his wound been hurting more than normal, he spent hours pulling Lucifer out of a particularly nasty zone, which gave him a migraine. Normally, guides and sentinels help each other out, but having only one side help can lead to a lot of pain for the active person. Alastor is expending a lot of mental energy, but not receiving any help from Lucifer, leaving his shields in tatters. Feeling the animosity from Lucifer, Cherri and Angel sets him off, causing him to quit. Lucifer starts zoning a lot again, leading to him hiding out in his room until Vaggi gets him to go after Vox.
Everything else mostly goes as in canon, with Alastor sending his shadow to help Lucifer with zones a few times while they are both Vox's captives. Afterwards, Lucifer falls into an incredibly bad zone on touch due to the pain of his wounds, which Alastor recognizes. Alastor grabs him, transports them back to the hotel, bandages them both up and guides Lucifer out of the zone. But at this point, Alastor has just expended all possible energy, and collapses into a fugue state. Lucifer awakens in a daze, running mostly on instinct, to his injured guide collapsed on top of him. He freaks out, healing Alastor and reinforcing his shields, but in doing so, forms a temporary bond. The two of them are too tired and injured to even attempt to break the bond, so they have to tolerate each other for a while. While doing so, Lucifer finally acknowledges/realizes all Alastor has been doing for him, leading to him insisting on helping shore up Alastor's shield more. Doing so, they find more and more in common, leading to them to initiate a courting period to see if they'd like to make the bond more permanent.
Not sure exactly where this goes from here, just like the idea! Especially if people find out about Alastor being a guide and just...don't believe it lol.
