As you can see, most of Japanese anime are outsourced to Korea. Most of key animations are done in Japan but some anime needs an outsource animation editing - perhaps, Korea as the major outsource. My point on doing this stuff in my blog is relating anime characters which are either Korean outsourced or non-Korean outsourced in the places in Republic of Korea.
For example, Magical Girl Lyrical Nanoha the Movies (1st and 2nd A's) are outsourced to Korea for further animation editings. That means, Fate Testarossa, Nanoha Takamachi, Hayate Yagami and other Nanoha characters are related to the places in Korea.
Most of the Korean Animation firms such as Seoul Loft, DR Movie, Sung San, Sunwoo, Jiwoo, Hanjin and other firms are competed each other in order to make an outsource animation for the certain anime. Examplis gratia, Naruto is outsourced to Seoul Loft while an outsource animator from Korea, Sang Jae-youp/상재엽 made the outsource animation for FullMetal Alchemist and Bleach.
These are the reasons why Japanese anime needs outsourced animation. Japan's animation industry is struggling. Anime workers are unhappy, toiling long hours at low pay. Sales have been declining. On top of that, there is fast-growing competition from across Asia. Studios in China and South Korea now churn out high-quality anime-style programs, helped by cheaper labor and, in some cases, government subsidies.
The Japanese government says it is trying to support the industry, with plans to increase spending on education and training young animators and allocating more funds toward film marketing. But nurturing home-grown talent has become more difficult as Japanese companies increasingly outsource anime drawing to studios in China, South Korea and Vietnam, where labor costs are lower.