Alexander is the youngest of the triplets and the most troublesome. He often teases Flora and even likes to watch storms scare her, despite all this, he has her back. He often plays with his older brother, and usually drags his siblings into a little trouble like when he piloted an airplane and got into a hot air balloon without realizing a storm was coming. He was the first one of his siblings who tried to play with his newborn sister Isabelle. In later episodes he has shown to not want to be around her, by the end of the episode, he warms up to her. He is also a thrill seeker, often wanting to do things that most children his age would not be able to or want to do, such as riding a Ferris wheel or riding in a balloon. In Oh To Be An Adult, he is the first of the triplets to decide that he is old enough to make his own decisions. He is the most athletic of the triplets as he plays soccer, tennis, basketball and is a rower. He likes goofing around and making others laugh, for his eleventh birthday he got a squirt gun. He also enjoys reading comic books including the Scarlet Pachyderm, he even gets excited when Uncle Arthur dresses up as the Scarlet Pachyderm, even though it did scare his little sister. There have been multiple points in the show where even after the siblings are told something is not true he'll still believe it is.