>>122998563>>122998597>>122998599Alex is ambiguously brown. They made her mom wear a Chinese dress to a formal and have a Hispanic name Carmen. Her skin tone is that of African. while Alex tone is that of a mix. They never gave any of the characters an age so you can't expect a official statement.
Overall Alex can be Indian, Latina, Black, Middle Eastern, South Asian or whatever because of her mom and dad ambiguous origin.