Final Fantasy IV completely missed out on some character development of Rosa. Her bio says she's a skilled archer, but it is never shown in storyline, unlike other characters. During battles, Rosa rarely has time to fire any arrows because she's almost always having to heal the party. Late in the game, I often give up on the bows entirely because equipping a staff enhances her spell power. There aren't many, if any, battles where Rosa needs to use that archery skill. They could have made a dungeon where magic is unusable and enemies are weak to projectiles, just to show this ability.

I get that Archer is her secondary job, but they could have done something with it. The only thing they did is give her the Aim command.