I chose Sophie I hate Charlotte next and then Nate

then Sophie and Nate.

Uff such a pointless, horrible, poorly written, poorly acted character. Sophie's character infuriates me to no end; she's just downright pathetic. She doesn't exist in the narrative aside from being obnoxious to Bella and trying to do her in at every turn (because she's a borderline abusive sister who overworks Will and thinks Bella is a distraction ALL because she wants the money that comes from Will's successful diving career), aggressively pursuing Zane (like girl, it's never a good look to pursue a guy who is in a relationship; obviously they're both equally to blame for the cheating, but that's another story), and stealing the crystals form Mako to fulfill her materialistic, greedy needs. She has no other point; she's just a plot device to cause conflict.

Nate is a close second though. Can't stand his sexist, disgusting, creepy ass. He objectifies women 24/7, is a spoiled brat, and is an utter moron.

Charlotte's terrible, but she was a good antagonist, and I appreciate the narrative fleshing her out, even though season 2 spent way too much time on her character, which detrimental to the actual protagonists' development.