I'd recommend 'Your Lie in April'. It shares the theme of personal growth and has emotionally charged moments like Re Life. The art styles might also appeal to you if you like Re Life's.
One manga that could be similar is 'Erased'. Both have elements of time travel and character development.
Well, 'Overlord' might be comparable. They share the theme of characters having special powers and facing various challenges in a fantasy setting.
One manga that could be similar is 'Tokyo Ghoul'. It has elements of horror and supernatural creatures like in Monster Re.
One manga similar to Re:Zero could be 'Sword Art Online'. Both have elements of fantasy, adventure, and complex character development.
One manga that could be similar is 'Overlord'. Both feature complex worlds and characters with evolving powers and storylines.
It depends on your preferences. The anime offers a visual and auditory experience, but the manga might have more detailed panels and storylines.
The Re:Zero anime is largely based on the manga. It captures the key moments and themes well. There might be some tweaks in the animation to make it more visually appealing or to fit the episodic format, but the essence remains the same.
One manga similar to Re:Monster could be 'That Time I Got Reincarnated as a Slime'. It has a similar theme of a character being reborn in a fantasy world with unique abilities.
Another manga like Tokyo Ghoul:re could be Seraph of the End. It has supernatural elements, a post-apocalyptic setting, and character development similar to Tokyo Ghoul:re.
Some top manga similar to Re:Monster could be Overlord and That Time I Got Reincarnated as a Slime. They share elements of fantasy and character progression.