Bold wears a purple outfit and is very neutral. He is a very easy going when it comes to requesting help. If you remember his birthday of the first year (Spring 4), you can easily level his heart up and ask him for help around the farm early on in the game. Along with his brother, Staid, he is also the hardest worker of the Sprites.
All Sprites have a hidden skill level for each job that starts at 0. As you ask them to do tasks, the skill level will increase by 1. The higher the number of skill points, the better they will be at the chosen job. The maximum skill level for each job is 255 points. 
Note: The Harvest Sprites all share the same gift list. The gift list listed on this page is the same for every single Harvest Sprite.