I'm no writer, but I can think of a bunch of "unhappy endings" that are totally different from "YOU ARE DEAD".
- V trusts Arasaka. They say they will remove the Relic from V. They do so, but V's mind is so far gone that Arasaka has no other way to restore V's mind other than to hard reset her. V gets a fresh start free from any binds she ever had, leaving V's lover, friends and life behind. Depending on some life choices, V's mind is so far gone that Arasaka, rathen than reset her, implant her with a new construct. One that will do Arasaka's bidding with no questions asked. V is then used as a pawn to rid Night City of any competition against Arasaka, including V's friends.
- V lets Johnny and Rogue bust Arasaka. Alt manages to remove Johnny's construct from V's mind. But Rogue has once again grown fond of Johnny, and blames V for killing him this time. She sets all her contacts and mercs on a manhunt against V for killing Johnny, making V a fugitive. If V managed to form a lasting relationship with a lover, they will help V skip town and live their lives as Nomads, away from Rogue, always living in fear of her. If V has no lover, V's left alone in Night City, and, while planning the next move on a motel, someone knocks at the door. V asks "Who's there?", and hears a familiar voice. When opening the door V gets hit by a sniper bullet. Rogue is on a nearby roof, reloading her rifle.
- (The infamous good ending) V decides she doesn't want to bring anyone with her to Arasaka. V decides to let Johnny take over their body to let him finish off Arasaka one last time. The player controls Johnny in V's body, but with V's construct appearing once in a while like Johnny did (V would be wearing their initial clothes set), talking to him and so on. When V's construct appears, the player selects the voice lines, and Johnny replies. When Johnny finally destroys Arasaka's servers, all that's left is Mikoshi. Johnny asks Alt for help to destroy it, and both Johnny and Alt get sent to the cyberspace and destroy Mikoshi from inside out. Finishing off what Johnny had left unfinished, as well as finally reuniting with Alt turns Johnny's construct harmless, and V's mind is restored fully. V has only a little time to flee from the crumbling Arasaka tower, while Johnny and Alt share one last song as they corrupt Mikoshi and the Cyberspace.
EDIT- Since Alt's construct is no longer the Alt Johnny knew, Johnny might want to be sent to the Cyberspace because he believes by interacting directly with this Alt's construct, he might be able to restore his Alt, as he knew, so he has a reason to sacrifice himself.
There... Did those in like..... 15 minutes?