Why is Legolas in The Hobbit movies?

Related questions

1. Do Gimli and Legolas go to the undying lands?
2. Why does Legolas look different in the Hobbit?
3. Is Legolas banished from Mirkwood?
4. Are Legolas and Tauriel siblings?
5. What kind of elf is Legolas?
6. Is Legolas from Rivendell?
7. Do elves live forever?
8. Is Gandalf more powerful than Sauron?
9. How did the King of Rohan's son die?
10. How did Eomer die?

Tags

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2. #dwarves
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5. #books
6. #bilbo
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8. #stands
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14. #established
15. #legolas
16. #thranduil
17. #tramping
18. #novel
19. #around
20. #through
21. #immortal
22. #hobbit