If you're looking for manga similar to Osakana kara Jingai Tensei no Shusseuo Monogatari (Light Novel), you might like these titles.
A young girl dies on Christmas day and is reincarnated into the world of her favorite game as her player character!
A thirty-year-old Japanese male is teleported to Japan's warring-era. But instead of being reincarnated as a samurai or ninja, he is now a pony! Cute and spry, he is enjoying is carefree new life but all that changes when he runs into a human who is fighting off a bear attack! The pony dashes and rescues the man, and thus begins his new life...as a warhorse!
A run-of-the-mill otaku collapses from stomach pain after tasting raw pig liver and wakes up in a whole new world—as a pig, of all things! He’s helplessly trapped in his pen until Jess, a girl who can read minds, comes along and rescues him. Our porcine hero will have to work to keep his boar-ish thoughts to himself, but sweet Jess isn’t deterred. In fact, she wants to spoil this little piggy rotten! By Jess’s side, it seems like life as a hog might not be so bad after all, yet there’s more to this strange fantasy world than meets the eye. Jess is a girl of many secrets, and she’s in danger. But what can a mere pig with no special powers do to protect her from her cruel fate? Will his modern knowledge, quick thinking, and sharp nose be enough to ham it up and save her?
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...