Warning: If you are lucky/unlucky enough to be a RWBY fan, I warn you of minor shipping. Good day.
After the fall of Cinder, Jaune Arc was getting used to being in a family with Ruby. However, he realized his job wasn't done yet.
He heard about a monster named the Azure Knight, which held onto a blade that caused the Grimms to rally to him. His wife wanted to slay him, but Jaune was worried about her injuries. So he took his sword and shield and plunged into the battle.
On top of the Tower of Remembrance-Encounter
Nightmare swings Soul Edge around as he shouts, "Tremble in my darkness!"
Jaune draws his sword and turns his sheath into a shield as he replies, "I will never fear the darkness… I think."
Nightmare starts it with a furious strike, but Jaune raises his shield in time. Jaune sends two horizontal swings of his sword, and Nightmare takes a small step back. Jaune then swings his sword in an upward arc then grabs Nightmare from the front. Jaune smashes his face with his shield and runs him through before stepping back. Nightmare goes for a horizontal strike, but Jaune ducks, kicks him which sends Nightmare spinning, and then grabs him from behind. Jaune's sword pierces through Nightmare's chest, which he twists for extra damage and backs off again.
With his Soul Gauge full, Jaune shouts, "I hope this works!"
He slices Nightmare across the chest rapidly, with random but quick left and right strikes. Nightmare falls on his stomach, unable to continue.
"Wait… I-I did that?" Jaune asks himself as he twirls his sword awkwardly.
Jaune picks up Soul Edge from Nightmare's dead body, and he hears a voice whisper, "Take it. It is yours now."
"Jaune, don't!" a voice shouts.
Jaune turns around to see Ruby, using her scythe as a crutch.
"Ruby… what are you…?" he asks.
In response, Yang was spotted flying above the Tower of Remembrance.
"Jaune, don't take it," Ruby tells him. "It's evil. Throw it away somewhere. Please."
Jaune stares at Soul Edge. Inferno was tempting him to take it, to use its powers.
He shakes his head. His wife surely was more important than the power being offered.
With a mighty shout, he throws Soul Edge off the roof.
He turns to see Ruby smiling at him, tears sparkling in her eyes. He asks, "You ready to go?"
"Of course," Ruby replies.
Laughing, Jaune picks her up as she puts Crescent Rose away and carries her away.
The White Knight avoided becoming the Azure Knight. Soul Edge never became a problem to Remnant again.
And that was the master of harems, Jaune Arc. I warned you all about Lancaster, so don't be whining. Now, anime rules:
Once again, no bigger than Night Terror.
They have to be capable of using combat fighting. For example, I can take Issei but I won't accept Rias.
Everybody suggested has to be able to fight. For example, no characters from those casual animes like 'Squid Girl' or whatever.
Finally, for the OC sample, I'll be using the strongest character I've ever made up: the boy avenging his entire family with the powers of Siris, Spawn, and Issei along with his own insane powers.