Those who read the "What If?" prototype fancomic will get the gist of this reference.

Okay, DJ Stellar Espio addresses Silent (the Protagonist) like this.

In this form, he's not a Ninja, but a DJ. Although, he still has the ability to sneak
and camouflage himself in the surroundings.
Also, the new elemental power of DJ Stellar Espio is: Galaxy (Cosmic)

Fun Fact: He's also impressed with Silent, because she has the ability to quietly
sneak up and literally disappear before the eyes, when no one is looking at her.

(Yes, this is also a reference to the initial pages of the prototype.)