Saint Michael the Archangel isn't a saint, but rather he is an angel, and the leader of all angels and of the army of God.
Saints
Here is CatholicBrain's index of Saints. This is a great resource for learning about the lives of the saints at home or in the classroom!
Saint Agatha
Virgin and martyr, died at Catania in Sicily, probably in the Decian persecution (250-253)
Saint Michael the Archangel
Saint Michael the Archangel isn't a saint, but rather he is an angel, and the leader of all angels and of the army of God.
Saint Aloysius Gonzaga
Jesuit student, who died in 1591 at the age of 23.
Saint Alban
First martyr of Britain, d. about 304.