extremely petty things Atlas would do if forced to work in the palace while Lucio was around or if Lucio came back while he was there:
this is assuming he eventually stops just trying to maim the man on sight
train himself to vomit on command and do it whenever Lucio said anything especially distasteful
home alone style traps spanning the entirety of Lucio's wing, it's well known he's the one doing it but keeps coming up with new shit to do and new ways to sneak in and thus can't really be stopped, however Lucio's bathroom is NEVER messed with, and when asked why Atlas responds "well I don't see the point if he never goes in there"
getting Mercedes and Melchior not only to like him better, as a given, but having them make a big show of it whenever they're all in the same room
teaching Camio new phrases, specifically ones that list Lucio's past crimes and ones that taunt him about his insecurities. Camio's absolute favorite becomes "I bet mommy's real proud, huh?"
keeps sneaking the garden peafowl into Lucio's bedroom, genuinely how he keeps getting them in is beyond everyone
locks itself in one of the dungeon cells voluntarily when Lucio is throwing a temper tantrum and smugly watches, key in hand, as he rattles the bars from the outside screaming til he's red-faced, not a single word other than "Aw, big feelings!" until Lucio calms down enough to get especially embarrassed since by now a crowd's probably formed
PDA with Valerius turned up to an 11, absolutely shameless and almost enough to make even itself grossed out, but Valerius goes along with it because they're both petty little shits who live for drama
singles out the servants that Lucio is rude to and grants them exorbitant bonuses and paid vacations in front of him
makes illusions of Lucio's favorite foods and leaves them on the dining table constantly, so Lucio gets all excited then bites into thin air every time
if they are playing piano and Lucio enters the room they instantly switch to Entry of the Gladiators
keeps making more and more realistic replicas of plague beetles that he hides in every single one of Lucio's possessions, its like the fuckass tiny plastic baby thing people do but it's plague beetles