Answer:
Playful
Step-by-step explanation:
It would have been easier and better, had you specified the haiku in particular. But since you didn't, I'd have to do a generalisation.
A haiku poem is a different kind of poem, it usually is composed of 17 syllables. The syllables are also composed of three lines. Some call it word groups. They are more times than not unrhymed. Depending on the haiku, it can be serious, or mild and playful. But mostly and on a general note, they are playful.