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The Perfect Devil Trigger is an unused devil form that was originally set to appear in Devil May Cry 4, but the possibility of that was dubbed as impractical. It appears to be a second or ascended form of Dante's normal Devil Trigger, in which his power increases exponentially.
According to the information translated from the Art Book, the Perfect Devil Trigger's power far surpasses that of his father, the Dark Knight Sparda. This, in turn, causes Dante to be seemingly all-powerful and nearly impossible to defeat. However, this form is dangerous, due to the fact that Dante will eventually lose his humanity and become a feral being.
According to the illustration of Dante's Perfect Devil Trigger, Dante grows a pair of wings, and Rebellion becomes a tail. His body becomes almost entirely black, save for some red, glowing cracks in the chest, hands, tail, and inner wings. No other abilities have been described, but it is possible that the form serves a similar function as Dante's Majin Form, yet even greater in terms of power and with various other abilities in its arsenal.
Now with Nero's possible "Perfect" demonic form, he has been shown to take on a more physical transformation consisting of blue and red-colored features, an alterated Devil Bringer, a full sheathe and a pair of wings & legs that mirror the shape of Dante's own demonic form. His wings also are demonstrated to opening up, ready to seemingly prepare for flight. He might also obtain an enhanced set of abilities, or the exact same type, however none of this was confirmed to be true.