The Igbos worshiped a host of alusi [gods and deities], they created new ones for special events and happenings such as wars and diplomatic meetings. 

A deity [god] could be invoked to oversee the on goings of a particular diplomatic mission to a nearby village or to guide the warriors to victory. Whatever the reason was, the Igbos practices Polytheism—the belief in more than one god [just like the Greeks].

The Igbo gods were so many and controlled different spheres of human life; it was permitted for more than one god to control the same sphere of influence.

List of Most Influential Igbo Gods

Ani

Kamalu

Ogwugwu

Agwu

Agwu Nsi
Anyanwu

Eke

Orie

Afor

Nkwo

Udo

Idemili

Otamiri

Ani

Ani is regarded as the Mother of the Igbo Pantheon. She is the goddess of the Earth, Earth includes everything Earth and not just the soil. As such Ani controls many spheres of influences such as the harvest, Ala Mmuo [the land of the dead], the sacredness of creation, life. She is basically the hallmark of Igbo civilization.

She is known for her generosity and kindness to all especially pregnant and expecting mothers who offer sacrifices at her shrines to facilitate childbirth.

The importance of Ani can be seen in her representation in all Mbari Houses appearing all over Igboland. Among the Igbo gods Ani is perhaps the most important deity because she represents all the Igbo stands for.

Ani is also known as Ala [the Earth] and is sometimes regarded as husband to Kamalu.

 

Kamalu

Kamalu popularly known as Amadioha is the Igbo god of Lightning, Thunder and Justice and oaths. He functions similarly to Thor [Norse], Zeus [Greek] and Shango [Yoruba]. His symbol is a ram.

He is known for his fiery temper and his quick nature just like that of lightning. Kamalu is quick to kill those found guilty by his oracles. His punishments are said not to be mediated and his temper if left unchecked by the Mother Goddess Ani can blaze through Igboland and exterminate the nation because of the guilt on everyone. People killed by Amadioha have a black mark on their body or will have their genitals missing.

Amadioha is revered by cults all over Igboland especially in Aro where cults that once revered him still function. He is pictured sitting beside Ani in Mbari houses all over Igboland and is said to be her husband.

Ogwugwu

Ogwugwu is a rather complex deity. It has different manifestations both as male and female and different functions depending on its manifestation.

Ogwugwu-Akala is a minor goddess in the Mbaitoli area of Imo State that is responsible for the keeping of boundaries.

While Ogwugwu-Ntibe is also a minor god in the same area responsible for victory in battles and cases.

Ogwugwu is also revered by cults all over Igboland especially in the current Imo State but none of the known cults are still active.

Agwu

Agwu is the major Igbo god/goddess [depending on the view of the worshipper] of the Sacred Oaths and Promises. Not much is currently known about this deity except he strikes down those who default in oats sworn before his shrine or before his priests [ezemmuo].
He is the god of diviantion [igba afa] and also the chief trickster god in Igbo religion.

Taking Oaths [i  ̄nu iyi] before a shrine of Agwu or Amadioha is the ultimate show of innocence.

His symbol is a red clothe tied around two bamboo sticks.

Agwu Nsi

Agwu Nsi is the Igbo god of the healing arts. He taught humans how to make medicine from herbs and plants according to stories after he stole them from Ala Mmuo and brought them to the world of the living.

Igbos have worshipped Agwu Nsi as fervently as Kamalu or Ani since ancient times and his cults still have loyal devotees, one of them which told me the story of his journey into Ala Mmuo.

His symbol is a snake or the fang of a snake.

Anyanwu
Anyanwu as her name implies is the Igbo goddess of the sun and natural life. Her personality is merged with that of the sun as perceived by her worshipers. While Amadioha maybe rash and hot tempered, Anyanwu on the other hand is the divine source of natural life.
Her role should not be confused with Ani/Ala who is the mother goddess and ruler of creation.
Anyanwu is a goddess revered by all, this can be observed in other cultures that worshiped the sun because of its life giving attributes.
Apollo [Greek]
Ra [Egyptian]
While Anyanwu was a popular goddess, no records of any popular cults dedicated to her have been found. Her symbol is the sun disk or the circle.

Eke

The Igbo goddess of the Eke market day. She is responsible for guiding and guarding traders going to her markets on her day.

Orie

The Igbo goddess of the Eke market day. She is responsible for guiding and guarding traders going to her markets on her day.

Afo

The Igbo god of the Eke market day. He is responsible for guiding and guarding traders going to his markets on his day.

Nkwo

The Igbo god of the Nkwo market day. He is responsible for guiding and guarding traders going to his markets on his day.

Udo

Udo is the Igbo god of diplomacy. His sphere of influence extends to diplomatic meeting, agreements, court cases, diplomatic oaths.

He is pictured as an old man with completely grey hair wearing the traditional Igbo apparel of an Ozo [the highest Igbo social rank a man can attain].

His aura is gentle and he is the harbinger of peace while visiting his deadly judgement on defaulters in their sleep.

His symbol is a dove or pigeon.

Idemili

Idemili is the goddess of the Idemili people of Southern Nigeria. She inhabits the Idemili River flowing through the region and measuring about 24 metres above sea level.

She is a goddess of pregnant women, mothers and infants. She takes any offence against these people seriously and is known for her violent out lashes against offenders.

She is also the goddess of the python. Her symbol is a white cloth or the short pythons that live in and around the Idemili River. 

Images Courtsey of Imostateblog and coven