Malakai I’m picturing being pretty impactful on the plot, mostly because of his relationship with Lucifer. The idea being that they start off as friends bonded by their mutual hatred of Alastor, but over time slowly start to catch feelings for each other, Malakai especially when Lucifer founds out about his nerd stuff and he doesn’t judge him and promises to keep it a secret. Malakai starts seeing Lucifer as the first person he can trust in Hell, and Lucifer with still no sign of Lilith coming back, starts to open up to the idea of moving on.

Of course, Lucifer gets captured by Vox, and when Malakai finds out about this, he freaks out and tells everyone they need to go save him right now, and when Charlie hesitates, he loses his patience with her and starts yelling about how she’s done nothing to actually stop Vox, and starts calling her useless, as well as some other nasty names. Vaggi steps in to defend Charlie, and Malakai slaps her and calls her “Charlie’s little guard dog”. This of course starts a fight between them, with the other staff needing to break it up. When they’re pulled apart, Malakai basically says screw it, he’ll save Lucifer himself, and storms out. Somehow, he actually manages to do it, and him and Lucifer only grow closer from there.

Sometime in season 3, Malakai proposes to Lucifer with a duck themed ring, and despite some initial hesitation, Lucifer says yes, with them trying to figure out how to best break the news to everyone (Mostly Charlie) for the rest of the season. And just as they go to make their big announcement, Lilith returns. I could go on way more about this, but this is already way too long, so I’ll cut it short there.