For several years, Luis and Maria have operated the Fix-It Shop, where they repair an assortment of items, including an innumerable quantity of toasters. Luis founded the shop with Rafael in the third season. In 2002, Maria and Luis converted the store into a Mail It Shop, but reverted it back to the Fix-It Shop in 2006. In 2014, he began maintaining the Bicycle Shop (which was then manned by Nina the following season).
Luis has occasionally appeared as a heroic alter-ego, Señor Zero (a spoof of Zorro).
- The Sesame Street Block Party Coloring Book (1977)
- Sesame Street Goes West (1977)
- The Sesame Street Mystery Coloring Book (1977)
- Fix It, Please (1980)
- Frazzle's Fantastic Day (1980)
- The Count Counts a Party (1981)
- I'll Miss You, Mr. Hooper (1984)
- Big Bird's Bedtime Story (1987)
- Ernie's Neighborhood (1987)
- Bert's New Collection (1988)
- Cookie Soup and Other Good-Night Stories (1990)
- What's in Oscar's Trash Can? and Other Good-Night Stories (1991)
- Grover's 10 Terrific Ways to Help Our Wonderful World (1992)
- Elmo's Delicious Christmas (2005)