Adding personal touches to characters

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Right now I'm working on another book. There is always a book I'm working on when writing. But anyway one of my characters is a lab assistant so sometimes I add things like people looking at them in the way you would at something under a microscope or funny science things that people would jump to like zombies-infested bacteria. I also use a lot of sea-like jokes or terms or descriptions since its a merfolk book so you can't have something written without dropping that in. One person was referring to having things growing on his butt like it would be a ship and some other little sea creature terms.