The cast of enduring characters is one of Friday Night Funkin's most notable features. The vibrant lineup doesn't end with Daddy Dearest. Additionally, players come across characters like Pico, a gun-wielding rival with a fast-paced musical style; Senpai, a charming but evil character imprisoned within a retro-styled dating simulation world; and Skid and Pump, two animated children who infuse their songs with a Halloween-themed flavor. Each character fnf includes distinctive voice samples, musical selections, and animations that capture their individuality and function in the narrative. These characters contribute to the game's strong visual identity in addition to giving the gameplay more dimension.

The core of Friday Night Funkin' is music. Kawai Sprite, whose work combines electronic beats, retro elements, and vocal-style synth melodies, wrote the majority of the upbeat songs on the soundtrack. Every music is meticulously crafted to both express the emotion of the encounter and match the rhythm gameplay. As the difficulty rises, certain songs become intense and chaotic, while others feel lively and lighthearted. Players are kept interested and motivated to retry stages in order to become proficient in every rhythmic pattern by the way the music changes throughout each battle.

The unique visual style of Friday Night Funkin' is another feature that sets it apart. The game's hand-drawn animations are reminiscent of early 2000s flash animation and classic online cartoons, with vivid colors, exaggerated expressions, and bold shapes. Every combat feels vibrant and exuberant because the characters bounce and respond dynamically to the music's beat. Because it provides an enjoyable and nostalgic atmosphere that appeals to players of all ages, this visual charm is a major component of the game's appeal.