Oisin

Oisin (オーシン Ōshin) is a fairy mascot form the Welton Kingdom and a supporting character in Night Pursuit Pretty Cure. He is Eriu's younger brother and together they search for "Fionn" and live with Izuru.

Personality
Oisin is easily excitable and is quick to forget his surroundings, which almmost lead to him revealing himself multiple times. He has to be calmed down by Eriu often.

History
Oisin is a citizen turned fairy mascot from the Welton Kingdom, where he had lived for most of his life together with her parents and older sister, Eriu. Fairly recently, she and Oisin left their home in search of someone named "Fionn", who appearantly left to earth. Their first stop was Casablance City, since a friend of theirs lives there, who turns out to be Mochizuki Izuru and they haven't left since the appearance of the Pretty Cure and are still staying with Izuru.

Etymology
Oisin (オーシーン) - written as Oisín, the name means "little deer", derived from Irish os "deer" combined with a diminutive suffix. In Irish legend Oisín was a warrior hero and a poet, the son of Fionn mac Cumhail.

Relationships
Mochizuki Izuru - Izuru lives together with the two fairies and they seem to have known each other for quite some time. Izuru tries her best to protect the two, but sometimes still ends up needing help from the Cures.

Eriu - his older sister. She looks after him a lot.