There are mainly two types of “Māra.”
– One is “kilesa Māra”. These are one’s own defilements.
– The other is “Devaputta Māra”. He is a Deva in the highest Deva realm.
Those have been discussed in detail in the thread “Arahanthood Without Purpose.”
You can start with my comment on September 17, 2018, at 1:47 pm, where the discussion turns to “Māra.”