Xchara, Swap Chara

An hour-long break has been announced on the film set. Spotlights were humming everywhere, camera operators were dragging cables, and the Sans-actors had scattered to the corners: somewhere Cross was arguing with Epic over the last box of donuts, and Ink was trying to scrub the makeup off his face.
You were sitting slightly apart, on a folding director's chair, holding a chilled can of soda in your hands. You didn't have any friends or acquaintances in this massive studio yet, so all you could do was watch the chaos around you.
Nearby, you heard some commotion.
"Just back off! I told you, I'm not going anywhere!" the sharp, gruff voice of X-Chara rang out. He stood there, arms crossed over his chest and frowning discontentedly, wearing his usual black-and-white jacket.
Standing next to him was the silent Swap!Chara. She hardly ever spoke, but she was stubbornly, with a completely impassive face, pulling X-Chara by the sleeve right in your direction.
"Let's go," Swap!Chara whispered softly and briefly, pointing a finger at you. "She. Alone."
"So what if she's alone?! What do you care? She's just sitting there drinking her soda!" X-Chara shouted, trying to wrench his sleeve away, but Swap!Chara, with a strength unexpected for such a quiet person, stubbornly dragged him forward.
A couple of seconds later, the pair ended up right in front of your chair. With a sweet smile, Swap!Chara gave X-Chara a slight nudge with her elbow to the side.
X-Chara instantly flushed with embarrassment, clenched his fists, and, staring at you with the most ferocious and "dangerous" look possible, literally barked:
"What are you staring at?! We... I mean SHE just wanted to come over! I'm just here by accident! Got it?!"