Bart had originally been envisioned as "a much milder, troubled youth given to existential angst who talks to himself", but the character was changed based on Cartwright's voice acting.
Bart var oprindeligt planlagt som "en meget mildere, urolige unge gives til eksistentielle angst, der taler med sig selv", men karakteren blev ændret baseret på Cartwrights stemme-skuespil.