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A rival idea for Nero in a Devil May Cry 6?
Nero needs a rival in the next game since he's now in charge of looking after things in the Human World in Dante's stead.
Take God Hand for inspiration. Nero like Gene with the god Hand yet all human lacking demonic blood due to his half-breed father. His rival should be someone like Azel, Allen Wakler & Liquid Ocelot who's human and had a demon arm surgically placed on him due to either being handicapped, an accident or due to an incident that cost him his human arm.
He can be a good rival & partner for Nero in the DMC mobile branch.