A year has pass since Y/n went back to atlas as many things has happened the first being Y/n helping human and Faunus kind by killing huge swarms of of demons and Grimm from all around the world but even for someone like the Doomslayer it is nice to have a team to help him his kill demons with him and so that's how Y/n's team form

1st member Robbie Ryes codename: Ghost Rider

Y/n got reports of a flaming skull killing demons and thugs alike while driving a mustang the locals called the ghost rider in California LA as Y/n arrived in the USA at a bullhead landing in an airport in California as he begins his search for the ghost rider

In the lower parts of LA Robbie Ryes was currently working his day time job as a mechanic as his night time job was the spirit of vengeance ghost rider he was just a simple mechanic/street racer who was just trying to provide for himself and his little brother Gabe since their parents left them but about a year ago he gained these powers which had him turn into his alternate persona the ghost rider and met a man name Johnny Blade who was also a ghost rider who help train him as they became good friends however now he has no as 6 months ago demons attacked his city killed many one of them being his brother Gabe more would've been killed that day if wasn't for a man in Green armor who even demons feared as he killed every last one of them causing Robbie to admire this man as he was cut off by his thoughts a young man around 17 with green hair and freckles entering his shop on a motorcycle that man being Y/n

Y/n: "Hey you open?" He asked taking off his helmet

Robbie: "Yes what can I do for you"

Y/n: "Just need my bike check out and information about someone"

Robbie: *chuckles* "Well amigo you came to the wrong place for the second one" He said looking at the bike

(What Y/n's bike look like)

Y/n: "Really I'm pretty sure you can help Ghost Rider" He smiles as Robbies eyes widen "Now before you say anything I care to offer you something"

Robbie: "That being?"

Y/n: "I'm creating a defense force to protect this world and I wondering you in?" He asked holding out his hand

Robbie: "I'm in" He said as they shook hands

2nd Shiro Emiya Codename: Archer

In a plain with many swords imbedded into the ground as a man with Tan skin and white hair sitting on hill the mans name is Shriou Emiya a man who just wanted to be a hero of justice create a world where everyone can smile but now he is simply just a pawn of the supreme to clean up humanities messes as the man contemplated all his choices up to now

Archer: "My dream was nothing but a fantasy" He said while looking up to the sky

???: "Maybe together we can make your dream a reality" A voice said as Shriou turned around and saw a male around 17 with green hair and freckles

Archer: "Who are you?" He asked

Y/n: "My name is Y/n I go by many names one of them being the Doomslayer" He smiles as Shriou was shock

Archer: "What do you mean by making my dream a reality" He asked

Y/n: "I want to creat a world where people don't have to live behind walls and fear because of demons I'm creating a team for the soul purpose to protect everyone humans and Faunus do you accept and become the hero of just this you want to become?" He asked hold out his hand and Shriou smiles as their maybe hope for his dreams as he took Y/n's hand

3rd member Connor Codename: Knight sentinel

Connor is more or less the older 'brother' of penny and so to make sure Y/n will always be alright Jamie Ironwood  put him on Y/n squad

4th member Nero

Y/n travel to a place call fortuna where he encounter a season devil hunter Nero and when he found out the white hair male was part demon he tried to kill him and after a hard fight the two found respect for each other he also met Nero's sisters Dana(fem Dante) Valerie(Fem Vergil) and V along with some of his friends like Nico who made Y/n a new weapon the Bloody Mary while Dana gave him some of her old weapons with that Nero joined the team

(Dana)

(Valerie)

V

5th 6th 7th 8th 9th 10th 11th members: Karna, Achilles, Atalanta, Jeanne d arc, Shriou, Iskandar (Alexander the great)

Y/n  resurrected them and ask them for their strength and the all agreed that he is worthy to lead them

12th member Raynare

Y/n convinced to Rias to spare her and bring her into his custody which she agreed fearing for her and her servants lives she agreed and Y/n gave her two options join him or face death and she picked option 1

13th member Vail Codename: White dragon emperor

He heard rumors of the Doomslayers strength so out in the park one while out with his girlfriends Y/n was challenged by him at first he said no but when Vail threatens to kill his girlfriends summer and ruby Y/n went berserk and show 2% of his power and beat Vail in a fight that nearly killed him out both fear and admiration he asked Y/n to train him he said he would if he joined his squad with Vail agreed

14th member Laura Hollwe Codename: X23

Y/n and his squad actually rescued her from a lab experiment where she was the only survivor she join Y/n squad because she would become violent and hostile towards anyone but Y/n and she also considered Y/n's her mate and husband

15th & 16th members Miro and Kirishima Codenames: Phaser and Red Riot

During a recruitment mission in japan to UA Y/n met the two and saw how these two had potential so after a sparing match he asked if they wanted to join they agreed with out a second thought

17th 18th 19th 20th members Isabel Rex Ashoka Starfire

They all came from space at first everyone saw them as threats but Y/n didn't as asked them to join to help their cause and so they did

And so that's what remnant defense force Havoc squad was created