Jessica Rose plays Kara Danvers on the CW superhero drama show Supergirl as Supergirl and then Chris Wood is casted on season 2 of Supergirl, as her love interest Lar Gand Will the show spark a new romance? Erica Carson who's Jessica's best friend plays Elena Gilbert /Katherine Petrova on the CW The Vampire Diaries and is dating Ian both on screen and offscreen. But will these romances last?