Louis is a molehog, the deuteragonist of Ice Age: Continental Drift and a cameo character in Ice Age: Collision Course. He is a timid molehog and Peaches' best friend.
He is voiced by Josh Gad who also voiced Olaf from the 2013 film Disney's Frozen, Chuck from The Angry Birds Movie Ludlow Lamonsoff in Pixels and LeFou in the 2017 live-action remake of Beauty and the Beast.
Louis is a soft-spoken and nervous molehog who was always at Peaches' side where he is faithfully staying close by and always ready to help her when she needed it. He also has a massive crush on Peaches, but she is completely oblivious to it. He lacks much self-confidence in himself, and is thus easily intimidated.
Ice Age: Continental Drift
Louis first appears with Peaches in the forest as they start going to the falls, where the teenagers hang out, but Manny eventually finds them and he 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.
He later sneaks off to the falls with Peaches, despite his protests, and gets left behind when Manny finds her. Louis is later seen back near the falls, on a collapsing frozen waterfall, and he is saved by Peaches, who he lovingly stares at. Peaches then carries him off on her trunk.
Louis later overhears Peaches saying they weren't friends to Ethan and the The Brat Pack, which upsets him greatly. He lets Peaches know he heard her, then tunnels away.
When Gutt beats the Sub-Zero Heroes to the continent, he takes Peaches, Ellie, and the rest of the herd hostage. Manny voluntarily came aboard Gutt's ship to exchange himself for his daughter, but Gutt went back on his word, stating Manny took everything from him and the callous captain intended to do the same until Louis stood up to the big ape.
Amused, Gutt accepted Louis' challenge, telling Gupta to let the molehog have a weapon. Louis threw the weapon into the air, distracting everyone as he burrowed into the ice, popping up by Gutt and smashing a heavy piece of ice onto Gutt's foot. The pain distracted Gutt, enabling Peaches to escape as an all-out brawl between the Sub-Zero Heroes and the pirates ensued.
In the end, Louis is finally allowed to hang out with the Brat Pack and Manny lets him and Peaches explore theiir new home.
Ice Age: Collision Course
Louis only appears in a small cameo at Peaches' and Julian's wedding party.