Senno Aki (せんのあき), also known as TONKO (とんこ), is a Japanese illustrator who worked on several Genso Suikoden Card Stories cards in the early 2000's.
They used the pen name TONKO as an employee for SNK. TONKO worked on character designs for many SNK titles, including Garou: Mark of the Wolves, SNK vs. Capcom Card Fighters DS, and Day of Memories.
After leaving SNK Playmore, Senno Aki continued to use the TONKO name for works commissioned for SNK products.