Mani is the Moon god of the northern pantheon, he is brother to Sunna, the goddess of the Sun.
Mani has more affection to the humans of midgard than his sister, he often wanders making contact with the mortals, watching over them and giving protection. There are many tales of him, recruiting people and taking them to Asgard, especially children, when these are being abused or mistreated, this is one of the reasons which lead people to pray to him in order to ask protection of a specific child or a group of children. Speaking of children, Mani never travels alone, he has with him two companions called Bil and Hjuki, they are brother and sister and one day Mani saw how these children were mistreated by their cruel father and so Mani took them away and brought them to Asgard and till now, they are always with him in his journeys, helping in what they can. He is also the god of mathematics and other rational thoughts that require counting and numbers. He is also a god of reflection, showing us that we all need to pause sometimes to reflect upon our thoughts, measuring and pondering our deeds or what must be done in certain occasions.
As i have told you, one of his gifts, is giving protection to children and also to the mentally ill people, he also blesses those who travel by night and gives good dreams and good sleep. It seems he likes music in a different way, he has a different precession of music, more delicate, so whenever you see him, if he is willing to work with you for some reason, you better know how to play some musical instrument.