Even with all the duds in Fire Emblem and Chrono Cross and Final Fantasy, I'll go with a controversial pick, too - Marle from Chrono Trigger.
Edit: Her design is great even if her spritework isn't, and she's outpaced by everyone else in terms of damage. Couple that with her dedicated role as healer being stepped on by heals from people with actual combat utility like Frog and Ayla, and she's only really useful for Techs and battles of attrition.
Edit: Her design is great even if her spritework isn't, and she's outpaced by everyone else in terms of damage. Couple that with her dedicated role as healer being stepped on by heals from people with actual combat utility like Frog and Ayla, and she's only really useful for Techs and battles of attrition.