Why is Dr Robotnik now called Eggman?

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Tags

1. #sonic
2. #known
3. #first
4. #developed
5. #eventually
6. #prompted
7. #referred
8. #robotnik
9. #archenemy
10. #originally
11. #switch
12. #character
13. #becoming
14. #called
15. #eggman
16. #explains
17. #before
18. #hedgehog
19. #japan