Is "Arthur," a television series from 1996, about Arthur being happy and wanting to make friends with Rugrats, a 1991 Nickelodeon series, and Tommy Pickles when he's happy to see him?

No, that is not an accurate description of the television series "Arthur." "Arthur" is actually an animated children's show that follows the adventures of a young aardvark named Arthur Read and his friends in the fictional town of Elwood City. The show focuses on themes of friendship, family, and growing up. It is not related to the Nickelodeon series "Rugrats" or its characters.

No, that is incorrect. "Arthur" and "Rugrats" are two separate television series that were never connected in any way.