The dark force stopped and created it's twisting black and red portal of pure chaotic energy pulling out whatever holiday related minion it could form based on the nearest one... the colors twisted and squeezed until out popped out...
A cheery woman in a red aerobics singlet, blonde haired pulled back into a pony tail with a black headband and matching legwarmers... looking more like an 80's aerobics instructor than anything wicked.
"uh... you aren't really what I had in mind... what is your deal?" the force says confused.
"Well obviously master... it's time that the Heroes and Villains get whipped into shape... after all "it's a New Year and time for a New You!"
"Alright... I guess you can... go do that then...." the force said miming scratching it's head... which is hard as it doesn't particularly have an actual shape.
The Trainer blows her whistle and a portal opens up leading her to the combined Earth.