Joy Butterfly

Joy Butterflies are blue butterflies that appear as a result of certain Kinstone fusions in The Minish Cap. There are three different joy butterflies to catch, which will each either increase Link's speed in shooting arrows, digging , or swimming.

Joy Butterflies are small and slow and therefore are easy to catch. Link can just walk over them to catch it.

Trivia

 * Joy Butterflies could be a reference to the fact that in The Wind Waker, Joy Pendants are shaped like butterflies.