cheese it.
dante - look up red orb farming guide and do that until you have like 5 million or more. abuse the fuck out of the meteor and mini faust(just hold down shoot whilst mashing trickster dash until the demons die lmao)
nero - pack several ragtimes and stay in the air as much as possible. use ragtimes and buster arms against bosses.
V - spam invincible shadow sidestep whilst spamming lightning shit with griffon