Okay, technically it's Mega Neko, a new Mega Man-inspired t-shirt now available for $24.99 over at Pengew Apparel. Inspired by the Japanese Maneki-neko statue, which is said to bring its owners good luck, the description reads "This little kitten will bring you good luck. Wait, not just good luck. MEGA GOOD LUCK! Also, a few E-Tanks too."
Thanks for the tip, Joshua!