They are usually preppy, acting extremely cringey. Some aren't preppy, but they are all an enemy to the PHD, as they still really like pookies. Most of the adopting ones act all rich and famous so pookies will say yes to them, which makes no sense, since if they base you off of your look, they're a bad pookie, even for a lover.
Many Pookie Lovers were part of the Pookie Protection Program, and they adopt pookies and protect them from the Pookie Haters. Since the Pookie Protection Program was disbanded, Pookie Lovers have been trying to keep their name, and protect pookies as much as possible, which sadly does not always work since PHD Agents and Pookie Haters in general can easily sneak in the igloo to kill the Pookies.
An example of a true Pookie Lover: http://clubpenguin.wikia.com/wiki/Thread:244776
User Jj131 is giving good points about why Pookies are bad while Sir Jjoeyxx argue against him that he is not right in his vision of Pookies as "cute littles sweetie pies", completely blind about their true motives.
Pookie Protection Program