Mara , according to the specific Buddhist and Hindu Cosmology, is the leader of the heaven above Sakra, prince of the Devas.
https://www.accesstoinsight.org/ptf/dhamma/sagga/loka.html

In Mahayana Buddhism. There are traditionally 
these four types of Mara
In traditional Buddhism, four metaphorical forms of "māra" are given:[5]

Kleśa-māra, or Ma̋ra as the embodiment of all unskillful emotions, such as greed, hate and delusion.
Mṛtyu-māra, or Māra as death.
Skandha-māra, or Māra as metaphor for the entirety of conditioned existence.
Devaputra-māra, the deva of the sensuous realm, who tries to prevent Gautama Buddha from attaining liberation from the cycle of rebirth on the night of the Buddha´s enlightenment.
This Devaputra Mara is , according to Buddhists , a real sentient being.
He is destined to become a  Pratyeka Buddha. His followers might not be so fortunate.
See Chart below
III. The Sensuous World (kama-loka)
HAPPY DESTINATIONS (SUGATI)
Realm	Comments	Cause of rebirth here
(11) Devas Wielding Power over the Creation of Others (paranimmita-vasavatti deva)	These devas enjoy sense pleasures created by others for them. Mara, the personification of delusion and desire, lives here.	· Ten wholesome actions (MN 41)
· Generosity

· The development of virtue and wisdom (AN 10.177)

(10) Devas Delighting in Creation (nimmanarati deva)	These devas delight in the sense objects of their own creation.
(9) Contented devas (tusita deva)	A realm of pure delight and gaiety. Bodhisattas abide here prior to their final human birth. This is where the bodhisatta Maitreya (Metteya), the next Buddha, is said to dwell.
(8) Yama devas (yama deva)	These devas live in the air, free of all difficulties.
(7) The Thirty-three Gods (tavatimsa deva)	Sakka, a devotee of the Buddha, presides over this realm. Many devas dwelling here live in mansions in the air.
(6) Devas of the Four Great Kings (catumaharajika deva)	Home of the gandhabbas, the celestial musicians, and the yakkhas, tree spirits of varying degrees of ethical purity. The latter are analogous to the goblins, trolls, and fairies of Western fairy tales.
(5) Human beings (manussa loka)	
You are here (for now).

Rebirth as a human being is extraordinarily rare (SN 56.48). It is also extraordinarily precious, as its unique balance of pleasure and pain (SN 35.135) facilitates the development of virtue and wisdom to the degree necessary to set one free from the entire cycle of rebirths.

· The development of virtue and wisdom (AN 10.177)
· The attainment of stream-entry (sotapatti) guarantees that all future rebirths will be in the human or higher realms.
See this excerpt, from the website, Access to Insight.
https://www.accesstoinsight.org/ptf/dhamma/sagga/loka.html

(11) Devas Wielding Power over the Creation of Others (paranimmita-vasavatti deva)	These devas enjoy sense pleasures created by others for them. MARA , the personification of delusion and desire, lives here. causes for rebirth in this heaven	· Ten wholesome actions (MN 41)
· Generosity