Skeleton Knight in Another World

Oh look, another isekai! Haha. Ok, I actually started Skeleton Knight in Another World a long time ago with little dude then forgot about it and just recently finished it (only had about 5 episodes left).

It's a fairly standard storyline with the only major difference being that Arc finds himself isekai'd into the MMO that he'd been playing and he's basically a human (probably) who has been cursed to look like a walking skeleton. That's not normal, even for this fantasy world, so he wears some massive armour to cover that up.

Other enjoyable bits: he is continually geeking out over any cool fantasy stuff he comes across. A dragon? OMG! An elf? OMG! So even though he's a skeleton, he's honestly just adorable.

He's also so GOOD and PURE that Ponta (the little creature with a lot of tails) gloms onto him and adopts him, which helps him as others he meets know that the little creature like that doesn't normally associate with anyone and especially not anyone bad.

I wouldn't say it's a harem, though his main two companions are a dark elf fighter/mage and a beastfolk lady ninja. There's hints of jealousy from dark elf lady when he saves a "lady of the night" from some ruffians (pretty sure he didn't even realise what she was; he just runs in if there's a damsel in distress) but nothing overt. 

There's an adorable bro-mance between him and another beefcake beastfolk ninja dude where they wrestle and bro-hug.

Other than that, it's pretty standard -- he's OP as they come (singlehandedly defeats a hydra). The main conflict is that there's slavery in this world where the elves and the beastfolk aren't safe from humans. Some political intrigue.

I've heard there's a season two, so I'll probably watch it. Not so much for the plot, but because Arc is such an exuberant, chill dude.