Immortals

These 7 mythological characters have knowledge on various martial arts and science. Aswathama posses 64 forms of arts and 18 branches of knowledge, Parasurama is a warrior, killed crores of kshatriyas who misused their power and rule, Kripacharya was a teacher of various forms of war methods, Lord Hanuman and Vibhishana are devotees of Lord Rama and aided Lord Rama in battle with Ravana. King Mahabali is a good ruler and also a great warrior who trained Ravana. Veda Vyasa is a great source of knowledge.

Many characters in Ramayan or Mahabharat served their purpose in helping the Supreme God to establish peace and order in society. In the same way, these 7 characters are kept alive to serve their purpose back again in Kaliyuga and even these 7 are going to be Sapt Rishis after Kaliyuga.

http://www.mpag.in/2017/03/29/7-immortals-living-among-us-waiting-purpose-short-post/
https://www.youtube.com/results?search_query=kalyug+immortals
https://www.slideshare.net/search/slideshow?searchfrom=header&q=kalyug+immortals 

https://www.google.com/search?q=kalki+immortal