Ron's modus operandi so far seems to be throwing day players/guests under the bus.
If this is the case, perhaps it's better that some fan favorites have not yet returned to
Days.
Rory: He turns into a major drug kingpin who orders hits and knowingly sells tainted narcotics, which kill off Salemites in large numbers. Naturally, the Salem P.D. is too befuddled to discover who's the new drug kingpin.
Calliope: Rafe brings her back to Salem to help with an investigation, but instead she kidnaps Arianna II, Tater Tot, and Thomas and holds them for ransom in one of Salem's isolated cabins.
T: When Chloe refuses to hire him at Doug's place, he starts poisoning the food served to customers and then plants a bomb that's set to go off during happy hour.
Anne Milbauer: When Lucas again refuses her romantic advances, she drugs and kidnaps him, and holds him prisoner in a crawlspace at the Spectator building.
Maxine: She returns to University Hospital, starts poisoning patients, and then frames Kayla and Dr. Henry Shah.