His Eminence Nikodemus, Metropolitan of Nigeria (born Dimitrios) Totkas was born in Berlin, Germany in 1975, where he completed his schooling in the German Educational facilities. He holds a Degree in Social Theology from the Theological Faculty of the University of Athens.

He was tonsured a Monk and ordained Deacon in 1999, by the late blessed Metropolitan Ioannis (Papalis) of Sidirokastro. He was ordained Priest in 2004 by His Eminence Makarios Metropolitan of Sidirokastro.

During the years 2004-2005 he served as Head of the Holy Metropolitan Church of St George Sidirokastro. He was in charge of Youth and a colleague of the camps of the Holy Metropolis.

In 2005 he was transferred to the Holy Diocese of Dimitrias and Almyros and then at the prompting of His Eminence Augustinos, Metropolitan of Germany he was assigned to the Holy Metropolis of Germany, where he served as parish priest in the parishes of Berlin, Leipzig and Aachen.

In 2015, at the prompting of His Beatitude Theodoros II Pope and Patriarch of Alexandria and all Africa, he was seconded to the Holy Metropolis of Johannesburg and Pretoria where he served as the Priest in the Hellenic Community of Klerksdorp North West, South Africa.

In January 2019, called by His Beatitude to the See of the Patriarchate he joined the Clergy of the Patriarchal Court. On the 2nd of February, following the proposal of the Alexandrian Primate, he was promoted to the position of director of the Private Patriarchal Office.

On April 21, 2019, he was appointed Chief Secretary of the Holy and Sacred Synod of the Patriarchate of Alexandria.

On January 12, 2022, on the proposal of His Beatitude he was elected by the Holy and Sacred Synod as His Assistant Bishop, under the title of the once glorious Diocese of Nilopolis. He was ordained on 17th February 2022 by Theodoros II, Pope and Patriarch of Alexandria and All Africa, at the Cathedral of the Annunciation of the Theotokos in Alexandria. 
On 15th February 2024 he was elected by the Holy and Sacred Synod of the Patriarchate of Alexandria as Metropolitan of Nigeria, Most Honorable and Exarch of West Africa. He was enthroned on 30th June 2024 in Lagos.