At times dramatic, at times insightful, but always hilarious, The Experimental Log of the Crazy Lich is a remarkable piece of web fiction. It takes the standard reincarnation plot and does several interesting things with it - e.g. the main character reincarnated multiple times; there was a vengeance subplot, but it's mostly already happened in the past, and in the present, there are more important issues to deal with; in the first ~60 chapters, 5+ characters have secret identities, sometimes multiple ones; the main char's Absolute Gentleman Alliance is ... unspeakable; instead of a pointless desire for power, we have a save-the-world plot, without a clear antagonist in sight; the main character's "cheat" is an unreliable level-up system with an unsupportive narrator / system voice, which mostly exists to troll the protagonist; there's a huge recurring cast of somewhat one-dimensional but always fun characters (so this is not a one-man-show); and so on.
Also, the protagonist is a flawed human being, but not a douchebag with no redeeming qualities (as is far too common in reincarnation stories). One might describe him as a crazy saint - most of his efforts are squarely devoted towards doing good, except that his means are often incomprehensible to those around him.
Also, the story has a clear theme of equality going on - there's deep hatred between the races of Order (like humans or elves) and Chaos (like the undead), and the protagonist devotes much of his effort towards mending this divide. So much for fantasy stories that can't teach anything of worth. About the only disappointing thing here is the story making fun of LGBT characters, but given the otherwise often remarkably forward-looking attitude of the story, I find this forgivable.
Highly recommened, except... the story is humungous, and while 1/6 to 1/5 of it has been translated so far (as of 04/2017), it will take an eternity for it to be completed. Still, I felt like even the Underground Autarch arc (chapters 1-71) had a satisfying conclusion by itself, so that would be a fine stopping point until more has been translated.