Frisk, Chara, Undertale characters, side by side, determined pose, striped shirts, knee-length shorts, heart lockets, brown boots, short brown hair, Frisk, red eyes, Chara, knife in hand, action stance, underground setting, pixelated texture, retro game style, ambient lighting, side view, dynamic composition, cavern background, glowing flowers, echo flowers, SAVE point, soft shadows, digital art, vibrant colors, 2D perspective, medium shot.