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Pascal is the tritagonist in the 2010 film Tangled. He is Rapunzel's best friend and confidante.
Pascal is a true and loyal friend to Rapunzel. Even though he can't communicate verbally, it is clear that he is one of the driving forces in helping Rapunzel see that she needs to leave the tower. Pascal is constantly cheering her up, rooting her on, and refusing to allow her to take steps backwards. However, even though he cheers her on, he doesn't know much about the outside world either, and despite being just as excited as Rapunzel to experience it, he was originally just as afraid. Since he is a chameleon, he can change color, usually to express his mood with his colors.
Being Rapunzel's only companion, Pascal has grown very protective of the lost princess, as seen when they first encounter Flynn Rider, as well as Maximus, and most notably seen during the climatic struggle with Mother Gothel in the end. The chameleon doesn't appear to attach well to those who harm Rapunzel in literally any way, showing no remorse for Gothel when she began aging to death, going as far as to tripping her out the tower entrance.
Still, Pascal can be highly affectionate to those who seem worthy enough, as seen when Flynn falls for Rapunzel and vice versa; the chameleon showing sympathy and support of the relationship, despite originally seeing Flynn as only a means to seeing the world. This is seen again through the chameleon's newfound friendship with Maximus in Tangled Ever After.
Source: DisneyWikia.com