You mean James, Harry's father, or James, Harry's son?Well, the answer is no.
If you mean, after the seven books, or eight movies: No, no such series is planned, apparently. but there is a prequel of harry potter ,which has story about james potter and sirius black.
Doesn't quite understand the questions, but i think you mean Voldemort in the movie number 2 or 3, but that is not horn and tail, that is blood.
Your question doesn't make much sense. Did you mean "Who is James Potter?" James Potter is Harry Potter's father. Harry was also named after his father as his full names is Harry James Potter. James Potter was also one of The Marauders (as in the Marauder's Map - "Messrs. Moony (Remus Lupin), Padfoot (Sirius Black), Wormtail (Peter Pettigrew) and Prongs (James Potter)". James was also Seeker for The Gryffindor Quidditch team while he attended Hogwarts and became Head Boy during his seventh year. James later married Lily Evans and became the father of Harry Potter. He sacrificed himself by fighting against Voldemort (without a wand as well) to protect Lily and Harry from being killed.
'Snivellus' is a nickname for (Professor) Severus Snape, and was used regularly by his school rivals James Potter and Sirius Black when they were boys.
Harry potter's is Daniel Radcliffe and J.k. Rowling's is Joanne Kathrine Rowling.
By unicorn if you mean zebstrika you can get one in the grass above mistralton city
his unicorn's name is Justin. That is if you mean the one he asks questions to...
If a man has a unicorn tatoo, it means they LOVE unicorns, which is awesome!
A frilly pink unicorn
There are 7 books. 1. Harry Potter and the Philosopher's Stone 2. Harry Potter and the Chamber of Secrets 3. Harry Potter and the Prisoner of Azkaban 4. Harry Potter and the Goblet of Fire 5. Harry Potter and the Order of Phoenix 6. Harry Potter and the Half Blood Prince 7. Harry Potter and the Deathly Hallows
I think it was Henry F Potter "the richest and meanest man in Bedford Falls"