Louis is a molehog and a major character in Ice Age: Continental Drift and a cameo character in Ice Age: Collision Course. He is Peaches' best friend.
Ice Age: Continental Drift
Louis first appears with Peaches in the forest, going towards the falls, where the teenagers hang out. Manny finds them and tells Peaches she shouldn't be out on her own. When Louis tries to point out that she isn't alone, Manny says that he doesn't count, as he is a weiner.
At the end, he rescued Manny, Ellie, Peaches and others from Captain Gutt.
Ice Age: Collision Course
Louis only appears in a small cameo at Peaches' and Julian's wedding party.