This question calls their character "The Load". It's not a term I've heard, and the words are too common for Google to be helpful (that question is the only relevant one on the first few pages).
What does it mean?
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Basically they are someone that is just a 'load' that gets dragged around by the hero, but either doesn't really do anything productive most of the time and the hero has to spend time that they could use saving the world protecting this load from harm.