There's a manga whose name I don't know

It's a comic I read when I was in primary school. Before 2000, my impression of it was already very vague. I only remember that some people were operated on or something. They were usually humanoid, but when they fought, they turned into monsters. The only thing I remember was that there was a creature that was not very strong at the beginning, called the "Experimental Body". In the manga, he was covered in muscles, but he was easily defeated by another creature.
I hope everyone can tell me the name of this comic! I'm so grateful ~~~

Answer 1

I can't directly check the name of a particular comic. However, I can help you better by providing you with some information about this comic.

If you can provide more background information about this comic, such as the platform it belongs to, the date of publication, etc., then I can try my best to find relevant information. At the same time, it can also provide some keywords such as Japanese comics, fantasy comics, Chinese comics, etc. for me to search for more relevant information.