The box witch with a covetous nature. She is a staunchly reclusive witch. Anything she covets she locks away within glass. The thoughts of her prisoners are laid bare, but one can strike her without thought without problems. Appeared in episode 4. (Source: Puella Magi Wiki)
He is a college-aged young man who left school after sustaining an injury and rents a room in the boarding house run by Ureshiko and Maiko. He begins to develop romantic feelings both for Ureshiko and Sayaka's adult form and decides to confess his love to Ureshiko. (summary from english wikipedia entry, based on actual episodes)
The shadow witch with a self-righteous nature. She continually prays for all of creation. She drags all life equally into her shadow without breaking her posture. One hoping to defeat her must know the blackest anguish. Appears in episode 7. (Source: Puella Magi Wiki)
A cheerful boy who dreams of being a paramedic, Ayumi falls for Mamoru quickly when he offers to take her to the nurse. Although he is in Ayumi's class, Ayumi only realizes that he is in fact Misao's younger brother a day after she meets Misao. He is somewhat taken back by Ayumi; he believes she is more fearsome than she may appear. Furthermore, despite Ayumi's feelings, Mamoru has a crush on his next door neighbor Misaki Yamamoto. He later runs away with Kusuda and Sogabe after he was turned down by Misaki. (Source: Wikipedia)
One of Three of Kurotora's nephews that died in episode 13 in the fight with Genba's army when they tried to take over Futago Pass in Ohu