Elu is a pronoun in Portuguese that is used to refer to someone who doesn't identify exclusively as male or female. Just like how some people like different types of ice cream, some people feel that they are neither exclusively a boy (use "ele" in Portuguese) or a girl (use "ela" in Portuguese), but somewhere in between! So, when talking about this person, we use elu instead of ele or ela. It's a way to be respectful and make everyone feel included and acknowledged, no matter how they identify.