If I had to describe Gaikotsu Kishi in one word, that word would no doubt be "infuriating."
Gaikotsu Kishi-sama, Tadaima Isekai e Odekakechuu is the most generic power trip isekai imaginable, but this time with a twist: the main character is a skeleton! Incredible. It truly is an ingenious choice, as without being a skeleton Arc would be the least interesting character of all time. Besides for Arc's overly formal speech patterns, I struggle to come up with even a single aspect of his personality. He has no discernible motivations for anything he does, and neither does he seem to care about much of anything. After being isekai'd he just decides "oh okay I'm gonna live here now :)" and that's it. The entire reason the second half of the show happens is because he goes "oooh elf! fantasy! woohoo!" and decides to tag along with Ariane and see what happens. It's like the author literally could not care less. Speaking of Ariane, she is the only other actual character in this show. Her defining features? There's two of them, and they're both on her chest. Classic anime moment.
These two dogshit characters act out an equally dogshit plot. Arc is supposed to be pretty much the most OP being in the universe, and that is demonstrably true given that every time he fights he wins in like one attack. But now our not very intelligent author has hit a roadblock: "how do I create any sort of tension or conflict when my main character is super duper OP?" To solve this predicament, the author has decided to have Arc literally just sit there and do nothing. Arc sees a group of ruffians kidnapping elves? He just sits there and watches when he could kill them all in one hit, just so that Ariane can have her epic entrance. Some weak as shit minor antagonist has popped up in episode 11? Arc has to just stand there and watch him talk for literally the entire episode, when instead he could kill the guy in 0.25 seconds. This, of course, is because we wouldn't have a 24 minute episode if Arc just killed the dude. In that same episode, some beast creature is about to clobber a passed out Ariane. What does Arc do? Does he use his instant teleportation skill to block the attack? Does he just kill the monster before it can attack? Nah. He just stands there, so that some other side characters can show up to save the day. There is no justifiable reason for anything to happen the way it does, other than that the author is lazy as hell and has no idea what he is doing. Everything anyone does is done for the sake of plot convenience. The characters are quite literally used as plot devices, rather than being actual characters with coherent thoughts and motivations.
In conclusion, I hate this show and it pissed me off. Thanks for reading.