That is Bucky O'Hare character Willy Duwitt.
The storyline of Bucky O'Hare follows a parallel universe (the aniverse), where a war is ongoing between the slightly inept United Animals Federation (run by mammals) and the sinister Toad Empire. The Toad Empire is led by a vast computer system known as KOMPLEX, which has brainwashed the toad population.
Willy DuWitt – engineer, a pre-teen human from San Francisco who enters the Aniverse via a portal between the ship's photon accelerator and his own accelerator at home. He replaced Bruce, the former engineer, who was killed (or in the franchise's terms, had "attained oneness with the Aniverse"). Later, Willy became stranded in the Aniverse when his parents turned off the photon accelerator back in his room. Bucky and his crew decide to keep Willy a secret from the S.P.A.C.E organization and the Toads.
The pilot episode is available on youtube.