2013, San Francisco: The first Kaiju attacks. 6 days, 35 miles, 3 cities, many dead, the beast was finally slain.
After the fourth one attacked, the world realized these things weren't going to stop. The world pooled its resources, the muggle and magical worlds put aside their resources for the sake of the greater good.
To fight monsters, the world created their own. The Jaegers, an unholy mixture of magic and machine.
Harry is an old Jaeger pilot. His drift pilot, his adopted brother, Ron was killed during his last drop. He woke up in the hospital feeling lost. He only left a card to Ron's wife, Hermione, a member of the research division, and left. He still wanted to help with the fight against the Kaiju and continued to help by working on the "Wall of Life". It was shortly after a Kaiju had just broken through a different part of the wall that a helicopter landed outside. Dumbledore had found him to drag him back into the life he had left.
Dumbledore takes him to the last Jaeger base in Hong Kong where he is putting together a last ditch effort to win. Among the personnel Dumbledore has collected he meets a man with a very green thumb, a surly Bulgarian, a blond git, a certain brunette he's dreading to face, and a pair of French Flowers.
In a world on the brink of destruction, how hard can it be to find love?
Due to how far this prompt deviates from canon, Harry could be paired with anyone, even OC's. Many people can work at the base, in non combative roles allowing for a wide cast. This could also deviate from the movie more than I have. I'm re-watching the movie before the series and this popped into my head.