I'm not entirely sure which specific 'true story' about Ed Helms you're referring to. He has a career in comedy, with his work on shows like 'The Office' and in movies. Maybe his true story could be about his journey from starting in improv comedy to becoming a well - known actor.
Yes, there are likely fanfictions out there that combine elements of Harry Potter and the Battle of Helms Deep. Fanfiction writers often like to mash up different fictional universes. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own.
An interesting plot might involve a prophecy that links the fate of both worlds. The prophecy states that only by combining the power of the Elder Wand and the sword of Aragorn at Helms Deep can the ultimate evil be defeated. Harry, along with Hermione and Ron, journey to Middle - earth. They face many challenges on the way. At Helms Deep, they have to work together with the people there. Harry uses his magic to enhance the strength of the defenders, while the others from Middle - earth contribute their combat skills. There could be a sub - plot where some of the characters from both worlds develop romantic interests in each other, adding an extra layer of complexity to the story.
The Hunter x Hunter manga is unfortunately not complete. The author has faced various issues that have led to intermittent breaks and an unresolved storyline.