Sylvester J. Pussycat Sr. spends most of his time chasing Tweety, Speedy Gonzales, or Hippety Hopper.

He first appeared, in his current form, in the 1945 short Life with Feathers which was directed by Friz Freleng.

Underground comics cartoonist Vaughn Bodē created Cobalt 60 in 1968.

After appearing in one story in 1968, the character lay dormant for almost 20 years. In 1984, Cobalt 60 was revived by Vaughn Bodē's son Mark Bodé and writer Larry Todd.

Another Robot Design.

Not much to say about this, it’s just an anthropomorphic rat.