As players venture deep into the galaxy and hop between planets during their time in the Mass Effect games, they'll come across a wide range of different species who all vary differently in their appearance. Though there are some who can barely reach the size of an average human, such as the Volus for example, there are others who tend to be a lot taller. Still, in a universe where anyone is able to receive biotic and genetic enhancements, it's also very easy for a regular person to make themselves much bigger if they so wish.