Alexander is the male protagonist of The Country Mouse and the City Mouse Adventures. He is the latter of the titular characters, meaning, in this case, that he is the one who loves living in the city (or "town"). He is the cousin of the other protagonist Emily. Alexander is shown to not like skiing or running a lot. In the series, he and his cousin go on adventures to various places around the world while contending with an evil rat called No-Tail No-Goodnik.
It is revealed in "The Big Cheese" that Alexander is allergic to tulips.
Another thing revealed (this time in "Posh Mice") is that he has two middle names (from after the first name to before the last): Xavier Reginald.
He is voiced by Terrence Scammel.