Skelly x Tuby collection is designed by Ferdi Trihadi; a visual artist based in Japan. The Tuby characters speak about the struggle in life that can certainly be overcome by "Hardiness & Determination" which is the essence of Tuby. The Tuby series come in a limited edition of chubby characters doing the sit-up.
Series 2 of the Skelly x Tuby collection features an astronaut and Japanese Kanji characters "kokoro no tsuyosa to ketsudanryoku" that translates "strength of the heart and the power to decide" print across chest. print across chest.