Man, the more I think about it, the more I realize how fucked up Nero most be in DMC5. Like seriously just picture this:
"You are a member of Order of the Sword. An organization that specializes in protecting people from demons.
Due to a string of events, you realize that others in your organization are demons trying to open the hell's gate on a stupid quest to rid the entire world from demons.
Along the way to stop them you'll fight a bunch of powerful demons, awaken your inner devil, fix and acquire one of the most powerful weapons/swords in the world (that you later on realize was used by Sparda's first born), fight with Dante the other son of the legendary Sparda twice, get his approval to use his brother's sword, realize that you are also a descendant of Sparda, beat the leader of the Order who has Sparda's power/weapon and save the girl you love and probably the entire world in the process.
Dante trusts you with Yamato for good. Sends you a Devil May Cry neon sign so you could start your own demon hunting business. You put the sign on a van and get on to demon hunting, making Dante proud and earning a living.
Several years have gone by since then. You are a pro at hunting demons now. You've managed to built a nice home for yourself and your lover close to sea.
One day when you are at home, the safest place in the world for you and your loved ones, someone/something sneaks up on you in your garage where you are fixing your van. He rips off your devil arm (the main source of your power) in mere seconds with his bare hands and leaves you bleeding to death. Your lover hears the noise and comes to see what has happened and all you can do while crawling towards the hooded demon/figure is to scream "KYRIE, GET BACK INSIDE NOW" totally helpless to do anything if the demon was to attack your lover.
A demon comes to your house, in your garage, rips off your arm (and steals the weapon that was trusted to you by Dante in the process) and all you can do is scream and beg/pray that he doesn't hurt your lover.
Even after you survive this attack, even if your lover survives this attack, how can any of you feel safe anymore? How can you live like this anymore? How can you not look over your shoulder every single second, expecting said demon to come back and finish the job? How can you even face Kyrie anymore? How can you ever feel safe again?"
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Like, damn dude. No wonder there are a bunch of dream catchers in the van. Nero probably still has nightmares about what happened that day.
I really hope they touch on this and show what sort of mental damage Vergil's attack on Nero must've done to him. He probably felt extremely helpless in that moment. That must've had a huge impact on his relationship with Kyrie and their life as a couple as well.
I know I'm most likely setting myself up for disappointment here, but man they can do a lot of cool stuff with this.