Been thinking about this for a while.
Since Vergil ate the fruit of the qliphoth, he would gain new abilities.
Like being able to manipulate and control other demons (read a fanfic the other day that focused on this), make anyone hallucinate if they make eye contact with him long enough for him to make them see things, telekinesis probably, his senses will be more heightened so he's able to hear and see everything from far away, can react faster than before , he can make clothes appear like how Trish could in dmc5, he doesn't have to eat or rest as much as humans need to but he still needs to take care of himself, stronger than Dante physically.
For his weapons, they would become more powerful that anything within his vicinity would be destroyed, y'know the gauntlets he has that can punch a hole in the ground, that would cause bigger hole, demons would be thrown across so far that its instant death, yamato and his spectral sword would be far more lethal. Think about how far more lethal judgment cut end would be.
The downside would be:
chronic migraines.
overstimulation of his senses.
not being able to sleep when he wants to but he needs to tire himself out which won't work because too much stamina. Not even melatonin helps
can't be in/near the city, sure he can wear noise canceling headphones but even those don't work.
Eating too much or nothing at all. Dude can go weeks without eating but the moment he's actually hungry its like three times more than what Dante eats. Saves them money but all that money can go down the drain rather quickly so they either buy beforehand or Kyrie gives them food because she makes too much
Having to keep his emotions in check because it can affect everything around him far worse than Dante. The air around him can feel suffocating for humans (even for Dante and Nero) if he's angry but can't let his anger out.
Feeling drained physically and mentally if he uses telepathy or telekinesis for longer than he normally does.
Wearing sunglasses inside when the lights are too bright for him, Dante resorted to keeping the lights off and buying darker blinds for Vergil. They don't need light to see in the dark anyway
Can't take the clothes he makes appear off because they're not real or something idk, which can be annoying because sometimes the shirt looks so nice that if he wants to buy it to have in his cabinet to wear, he either doesn't have enough money and/or it's too expensive.
