
If you're looking for manga similar to Saikyou no Marou wa Shizuka ni Kurashitai: Tensei shitara Fenrir datta Ken (Light Novel), you might like these titles.
An unappealing otaku awakens in the body of a pig after he passes out while eating raw pig liver. Pig finds himself in the company of Jess, an innocent girl who can read people's minds, and she accepts him despite his boorish thoughts... although she does plan to eat him. When Jess is in danger of succumbing to a dark destiny, can Pig save her using only his quick wits, wisdom, and refined sense of smell?
After being worked quite literally to death, corporate slave Routa Okami's dying wish is to be reborn as the well-loved pet of a rich family. When a compassionate goddess actually grants him his wish, Routa commits himself to the lazy, carefree, all-you-can-nap lifestyle of a pampered pup--complete with a beautiful owner and all the delicious food he can eat! But as Routa grows...and grows...and grows...he realizes something is terribly wrong. With his enormous body, razor-sharp teeth, and fierce visage, it's painfully obvious that he was reincarnated not as a dog but as a giant wolf. And not just any wolf--the legendary wolf king Fenrir!
42 year old "shachiku" (company slave) Matsuda Takeshi gets worked to death, as is customary in Japan. His one dying wish is to work for a decent enterprise, not the black company he had been working for. His wish is heard by a god who, for his own amusement, has him reincarnate as a young elf male in another world, with increased affinity for earth magic and ability to command golems. The new golem master sets out on a quest to acquire the Seven Treasures left behind by a legendary mage from 1000 years ago.
After being worked quite literally to death, corporate slave Routa Okami's dying wish is to be reborn as the well-loved pet of a rich family. When a compassionate goddess actually grants him his wish, Routa commits himself to the lazy, carefree, all-you-can-nap lifestyle of a pampered pup--complete with a beautiful owner and all the delicious food he can eat! But as Routa grows...and grows...and grows...he realizes something is terribly wrong. With his enormous body, razor-sharp teeth, and fierce visage, it's painfully obvious that he was reincarnated not as a dog but as a giant wolf. And not just any wolf--the legendary wolf king Fenrir!
Thanks to the black cat Gi with his magical powers, Midori has been reincarnated to a Princess Esmeralda in a parallel universe... but in the middle of her life! For some reason, the maids seem terrified of her and her fiance?, King Cyril, seems to hate her. Feeling sorry for Midori, Gi gives her the ability to morph into a cat... but the moment she became a cat, Cyril did a total 180! He's so loving and affectionate to cat Midori, but he can't hide his disdain for human Midori/Esmeralda. Now she has no choice but to do the best she can with what she's got! As he sees Midori put her all into everything, something changes in Cyril, too...
Life in the Great Pulha Woodlands is the very definition of stillness and tranquility—and Acer’s had enough of it! That’s right. Acer isn’t quite like the other high elves of the forest. For starters, he remembers living a past life as a human in another world...meaning he’s got a taste for meat, adventure, and plenty of other decidedly un-elven things! He’s also bored out of his skull after 120 years of the peace and quiet of their serene sylvan lifestyle. So with nothing more than his trusty bow, a bundle of life-giving fruit, and his close bond with the spirits of nature, Acer leaves the monotony of the forest behind to seek a new life, one that’s more his pace. See what excitement awaits in the outside world full of humans, dwarves, and even other elves!
With the progression of his Chuuni Disease, Shioda Tetsuya is shunned by his family, and dies in despair, a thirty three year old jobless virgin. He vowed that if he was born again, this time he would stay away from delusions and live life seriously. Fortunately, he reincarnated in another world as a girl named Tilea, and lived a happy life with her kind parents and adorable little sister, but... Lately, she'd been troubled. Her beloved sister had begun talking about how she was actually one of the Six Demon Generals, serving directly under Demon King Zorg, a descendant of the Three Great Demons. The situation was looking bad. She had to do something before this Chuuni Disease got any worse!