Gaikotsu Kishi-sama, Tadaima Isekai e Odekakechuu

Both shows are Isekai animé about a person who ends up being his own gaming avatar, which happens to be a skeleton, and ended up in another world. 

They both got isekaied into a game where they are basically overpowered and there's a monster fight in both animes that are basically the same. Big Difference being one has more ecchi.  

Both have main characters that are skeletons and they both have the same general fantasy adventurer tropes. 

-Both were gamers who were transported to the game. -Both have OP skills and equipments. -VRMMORPG style. 

MC is Isekai'd, overpowered in the new world, and has to hide his face from the general public. 

A guy suddenly wakes up in the video game they play as their OP character. While their characters/attitudes seem completely opposite, they both seem independent and not a wuss like so many mains seem to be these days. Both are fun to watch and put a smile on my face most of the time.  

Mc overpower,Mc is Skeleton 

Both main characters have been summoned to a game world where they are able to use things a game system has, able to use skills, weapons, and stats. If you want to watch a show where the game is more centered, better try Zanting! Rang Wo Cha Gonglüe, because this show is more of a show about the main characters playing a game to defeat the final boss and completing quests. Yeah, bugs, farming exp, and glitches are also present here. If you want to watch a show where it's more focused on fantasy, where the main character saves people, and doing guild quests, I recommend watching Gaikotsu Kishi-sama, Tadaima Isekai e Odekakechuu. This is more of an adventure, and saving everyone who needs help. read more 

Both shows are set in a fantasy world but with loads of gore and uncensored sword-cutting. They both contain women who get assaulted by monsters and/or bandits. Not recommended for kids! 

both overpowered isekai protagonist that are a blast to watch and so fun  

In general those shows are lightweight action-packed RPG-style fantasy adventure (with a piece of gore, sometimes) where main character somewhat differs from run-of-the-mill japaneese schoolboy. Main similarities: MC quickly became OP and almost never thinks about their previous life. They must hide their identity and team up with a girl to enjoy the life in new world as your regular adventurers. Both shows doesn't try to be more than they are, wich is good. But both practiculary doesn't dig "What if?"-theme from their title names, which can be dissapointing. Diferencies: The Skeleton is a big brother-like companion to tsunderish elfgirl, while the Sword is a teacher-like for childish catgirl. Sword makes food, Skeleton eats food. The Skeleton mostly fights against evil guys, while the Sword is just a monster-slasher (poor little things...). "Gaikotsu Kishi..." is more comedy-ish show with obvious gags and references, while "Tensei shitara..." doesn't touch those themes at all. read more 

Similarities: Sasaki to Pii-chan and Skeleton Knight in Another World both feature main characters who possess overpowered skills or knowledge that contribute to their success in their respective isekai worlds. They also share a common theme of enjoying simple pleasures in life, such as caring for cute pets or aiding others in need. Both protagonists find fulfillment in these simple acts amidst the challenges and complexities of their new environments. Differences: While Sasaki to Pii-chan focuses on economic strategies and interdimensional trading as the protagonist builds wealth and navigates business challenges, Skeleton Knight in Another World centers on a skeleton knight who, after reincarnation, uses his formidable abilities to protect the innocent and seek redemption in a fantasy realm. The former emphasizes entrepreneurial pursuits and societal integration through economic endeavors, whereas the latter explores themes of heroism, combat, and the protagonist's journey to overcome his past and forge a new identity. In my opinion, while both series feature protagonists with overpowered skills enjoying simple pleasures in their isekai lives, Sasaki to Pii-chan offers a narrative focused on economic success and strategic planning, while Skeleton Knight in Another World provides a blend of action, redemption, and the protagonist's quest to protect and make a difference in a fantastical setting. read more