I spent a week earlier this month riding trains, boats, and buses in Kyushu. Here are the two Eki-ben* I had.
The bento had rice mixed with ground chicken, kimchi, and sprouts. It also had a half boiled egg and hot sauce that you mixed into the rice. One of the best Eki-ben I've ever had. The tea and sake wasn't that bad either.
Toriten Nanban Bento.
Fried Chicken in Kyushu is called toriten とり天 instead of karaage からあげ. It's also cooked differently, the batter is more like a tempura batter than a typical karaage. Chicken Nanban, covering chicken with a egg tartar and thickened sweetened vinegar, is also local to Miyazaki prefecture. I got this bento at Oita station, not an official eki-ben, but really good!
*Eki-ben are box lunches that are sold in train stations throughout Japan that feature local recipes and specialties.