Sebastian is a minor character in The Loud House, who first appeared in the episode "Everybody Loves Leni". He is also the younger brother of Jackie.
Sebastian first appeared when he wanted to use the bathroom, but keeps getting denied as Leni goes past him so she can go in there to talk to her work friends.
He made cameo in "Camped!" playing with other kids in camp Mastodon.
He is a small and thin boy with tan skin. He has a hairstyle almost identical to Lincoln's, but it's black. He wears a yellow t-shirt, blue jeans, and white sneakers with black stripes.