I have been wondering if Dante were to get in, how his styles would be implemented or if they would not - especially since the Style mechanic would be unique to him and has been a staple since DMC3. The other mechanic I could see being implemented is the Royal Guard Gauge.
I've been speculating specials and I feel a conservative set with no styles would work but feel it might invoke the whole "anime swordsman" outrage. Basically:
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Ebony & Ivory: Press the B button repeatedly to fire. Tilt the Control Stick in the opposite direction Dante's facing to hit opponents behind you. Hold B to charge and once fully charged, attack becomes Honeycomb Fire.
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Stinger / Sky Star: On ground: Lunge forward with great speed. Hold B at the end of the attack to perform Million Stab. In air: Dash forward. Can be performed once but does not put Dante in helpless state.
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High Time & Helm Breaker: On ground: Launch foe upwards. Hold B to go upwards and press B to swing Rebellion downward. In air: Launch upwards and press B (optional) at the apex to go down.
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Royal Guard / Release: Assume a blocking stance. Blocked attacks fill the Royal Guard gauge. Perfectly timed blocks negate damage and significantly fills gauge. Imperfect / hold blocks receive a small percentage of damage and certain attacks (e.g. Warlock Punch, Shield Breaker) can break a stance. A full meter turns the move to Royal Release, releasing the rage built up. Royal Release zooms the camera upon hitting the foe.
(FS):
Judgement: Lunge at the foe. If anyone is hit: activate Sin Devil Trigger to assume Dante's ultimate form. Releases a volley of slashes from Devil Sword Dante culminating in an explosion for those unfortunate to get caught in the attack.