These three I'm only going to introduce to yall because they were the most memorable of the Web Novels/LNs that I read through in the last month.

Chiyu Mahou

Chiyu Mahou has the protagonist, Usato Ken, being summoned by accident along with two heroes.  Usato, being a kind-hearted young man to the core, isn't particularly annoyed or angered by this (Kazuki, one of the two heroes is more bothered by it than he is), but he has the misfortune to have a talent for healing magic, meaning he falls under the jurisdiction of the country's Lifesaving Squad.  Taken to the Lifesaving Squad, he is put through the wringer in a way only a healer (who can heal himself) can be, to increasingly hilarious results (from the reader's perspective) even as he is prepared to save lives on the battlefield.  This particular story is mostly enjoyable for the way the protagonist's common sense gets completely turned on its head (especially regarding his magic).  So, what is the mistaken use of healing magic?  1) Using magic to repair your body during and after extreme training, 2) Using healing magic to make sure the people you punch aren't hurt, 3) Using healing magic like a martial artist would use chi. 

To be honest, a great portion of the hilarity of this story comes from Usato himself becoming more and more of a 'muscle brain' as his solution to everything becomes 'punch it' or 'train myself'.

Magan to Dangan o Tsukatte Isekai o Buchnuku

This is the weakest of the three WN/LNs I picked up for this month.  I say this because the concept is the most straightforward and it is one that most people will wince at.  Essentially, the protagonist, Ataru, is offered a chance to reincarnate in a fantasy world full of violence, and he selects as his 'gifts' a gun that doesn't break, the ability to create various bullets, and a special eye.  The best part of this story, unfortunately, is the early parts, where he is just getting used to the world and his relationship with Kyaro (a bunny-girl slave who he healed then eventually released).  The worst part is how repetitive and predictable the story becomes as things continue.  This is one of a number of isekai LNs where I simply couldn't find it in myself to put it down but didn't enjoy nearly as much as I would have liked.

Kage no Jitsuryokusha

First thing anyone should know about the protagonist of this story... he is a total and unashamed chuunibyou that works hard to make his chuunibyou into reality both on earth and in the world he gets reincarnated in.  To give you an example, his source of despair on Earth was that he couldn't become strong enough to defeat a nuclear weapon, so he began trying to discover magical energy, and just when he was about to succeed, he died.  His greatest desire is to be the mysterious powerful figure who lives in the shadows and appears to alter the field of battle at key points in the story.  To that end, he creates an organization of girls he saves from a particular curse, Shadow Garden, unknowing that the goal he thought up out of nowhere (defeating a Diabolist organization that was working toward the resurrection of a Demon God that controls the church) is actually a real one and everyone else in the organization but him knows it.  This results in some seriously hilarious situations as he believes they are creating scenarios for him to have his fun (as in his mind, there is no way they wouldn't see through him), even as his subordinates really are setting him against the organization in question.