Clone Sonic "Tune-Up!":
~ "Remember, Silent. Fun or rather... Entertain is INFINITE!"

The Main Story Mode and Custom Night Mode Plot:

Clone Sonic "Tune-Up!" is the Main Mascot and Entertainer of Sonic Heroes Tera Pizzaomnia.

He was once the original Clone Sonic from FNaS 1 in Maniac Mania "Different Dimension".
Due to the new game rules and the change to Fierce Forces game,
he has been upgraded to the "Modern" look, now to be as known as Silent's "Realistic Imagination".

Unfortunately, when Sonic "Tune-Up!" goes into Evil Mode or even worse,
entering the Amok Mode. Instead of "Entertaining" the Player by force.
There is a greater chance that he will bite Silent "Player-On!" because of
F.E.A.R! extract, which also flows in her blood.

Although, even Sonic "Tune-Up!" is on opposite side Nefarious Empire and
Silent "Player-On!" is on Valorous Resistance side.
He likes her and want to become hers Favorite Character Number 1.

Both, Silent "Player-On!" and Sonic "Tune-Up!" like to tease each other.

However, Sonic "Tune-Up!" is extremely stubborn.
Thus, he's lock on Silent "Player-On!".
And he really don't want to let her go from his sight.
(Haz-Hint, aka. Faz-Fact: This is his "Game Mechanic".
That's why he usually knows where the Player is and follows)

The bond that connects them most is that:
The Game cannot function without the Player...

That's why he tries to keep Silent in imprisonment.
Sonic "Tune-Up!" is the Game, Silent "Player-On!" is the Player.