Note: There is also a Luna in The Sims 3: Generations LP. You can read about her here: Luna FendersonLuna Villareal is a pre-made Sim from The Sims 4: Get Together LP. She is a member of The Paragons and a Friend of Valentina York. She is also the sister of Max Villareal.
Luna played a key role in helping to boost Valentina's reputation with The Paragons. Luna texted the club leader, Siobhan Fyres, that Valentina was seeing an older guy. This caused Siobhan to instigate a club gathering at the York household, which, ultimately, brought Valentina one step closer to overthrowing Siobhan's leadership.
Luna would sometimes skip school to hang out with Valentina and seemed to be her closest ally within the club.