Buck and Maddie come from a family of shamans/exorcists who can see curses, evil spirits, urban legends, etc.
And Eddie is Buck's new colleague who is a magnet for Yokai and other creatures. Buck has a heart attack every day because every day Eddie shows up with something creepy (that he can't see) and Buck wonders how he's survived this long.
The answer is Abuelita, who also sees spirits and does her best to protect Eddie, and Christopher, who inherited Shannon's lucky star and tends to purify evil spirits with his presence.
The running gag of Buck and Maddie letting out a little high-pitched squeal every time they see Eddie is hilarious, also, some random people on calls having this reaction too if they can see spirits.
Buck obviously spends his time exorcising the curses that haunt Eddie, but nobody, know he's a shaman/exorcist, and so he tries to be discreet. (It failed)
Buck, offering Eddie protective bracelets that keep breaking, purifies him by "accidentally" spilling salt or holy water on him. Muttering exorcist rituals under his breath, filling his house with sigil discreetly, etc.
Bonus point if Buck and Maddie develop a side job of "Exorcist Hotline Hello?" Maybe with someone like May or someone else.
And another bonus point if Chris starts seeing the curses and is too scared of Eddie for a while because of the monsters haunting him, and he spends his time hiding behind Buck and Eddie is sad.
