Alejandro wears an old pale dark red shirt under a badly fitting old gray hoodie, dark blue pants with white stripes on the sides and white shoes. He has short black hair and a bit of a mess.
Alejandro first appeared in "Season Finale" as a child that Bob White could adopt. After they take Alejandro home to South Park, he refuses to accept his family. When the Whites protest the trail of Randy Marsh, Alejandro refuses to protest and put on sunscreen. After Bob White forcefully puts on sunscreen on Alejandro's face, he runs away and starts to destroy buildings and cars. Due to his sunscreen covered face, he is recognized by the public as "Mexican Joker". The South Park Police attempt to shoot him, but he runs off with a gunshot wound in his shoulder.
He does not appear in "Basic Cable" in the Blacks vs. Whites show on Amazon Prime Video. It is likely that he ran away from South Park or died from the gunshot wound offscreen.