Does liposuction to the buttocks have any side effects?

The fat of the buttocks is supported by a matrix of connective tissue. Liposuction can make the area look ptotic or droopy

I almost never recommend liposuction of the buttock.  Certainly bulk can be reduced in the buttock with liposuction but the previously smooth skin of the buttock can become very irregular due to the dense connective tissue and  compartmented nature of the fat of the buttock.  This effect tends to worsen with time.  Best to talk to several plastic surgeons experienced in this area.

Of course the answer to this question can only be made after evaluating your particular anatomy, defining and communicating your goals, and developing a plan with your surgeon.  Every person, regardless of their heritage, has a different anatomy.  They also have different goals.  In addition, every surgeon has a different quality of education, training and experience.  If you choose a surgeon who hears what you want, has the skills experience and techniques to achieve your goals, and designs a surgical plan based on your individual anatomy, you will get the best outcome.