Gwen is in a league of her own. From the lst when she hit town, she has been lying, manipulating, blackmailing, assaulting, & murdering. She left Jake, stealing some book, faked a breakdown to get sent to Bayview, (she needed to hide). Befriending Claire, she prodded her to tell all about the various family members. Claire gets released, Gwen manipulated releases for herself, meets John & Marlena, who let her stay. She returns the book to Jake, as it's owner was pestering Jake. Gwen has met most of Salem's characters, is at odds with Abby, stays friends with Claire, but with Gabi thinking Jake was her late husband Stefan, Gwen is on the outs with her. But Jake is a twin, claims his DiMera heirship, they move into DiMansion, Gwen makes deal with Chad against Gabi wanting to lay claim to DiMera's fortunes. Jake & Gabi get together, Gwen gets mad, Abby returns home....Sparks are flying everywhere, all negative. Now it comes out Gwen drugged Abby, got her sent to Bayview, out of the way. And that Gwen is Jack's unknown daughter, that Gwen's mom tried to see Jack, but Laura Horton paid her off to leave. When Laura tried to see Gwen to apologize, she ended up dead. Blunt force trauma. Gwen says accident, is believed. When Gwen finds out Jack slept with Kate when Jen was in a coma, Gwen gets Abigail drunk, and manipulates her into spilling it all in public. She used Chad's jealousy of Jake to make him think Abby was having affair, and then it all ends up with the drunk Chad having sex with Gwen on NY's eve. She first blackmailed Chad to let her stay in mansion, but of course told Abby. And when Abby learned from Rolf about Gwen drugging her & confront Gwen, she smirked about no one believing Rolf, Abby slapped Gwen who got a red eye. And so Gwen put make up on to fake a blackeye, accusing Abby of assault. Chad visited Gwen, wiped off the makeup, another Gwen lie comes out. And of course, Gwen is pregnant, Abby furious, Gwen miscarries, but before she can let Chad know, she gets into it with Abby, Gwen falls down the stairs, lying as she iuses this to claim Abby caused her NOW to miscarry. And this sets up blackmail by her Dr. Snyder to make her run drugs for him. Yep, pick up and deliver. When Xander learns, he talks to Snyder, wanting him to confess, while holding a knife to his throat. Alas, Snyder has heart attack, dies, Xander & Gwen throw his body in the lake. At one point, she was plotting to seduce a judge, in order to get case dismissed. And thus it all leads to learning of Kristen's kidnapping of Sarah, putting her on the island, Ava getting involved, Gwen knocking Abby out, she is on the island, escapes, gets Sarah back, And now Gwen switches the antidote with the drug left over from when she drugged Abby......& Sarah has the mentality of a tyke. And this is all a drop in the bucket with Gwen. Her lies, plots, manipulating changed or lost the lives of more than just one person.
Very definitely MORE than just a mere poisoner.