Immortalis is a stickman character created by Tentionmaru (Paul M)
You can see him in action in Zetabrand Exceed , Tentionmaru BSE (and Tention BSE V3) and Obliteration. This guy is borderline psychotic and has regenerative abilities. He is the worst enemy of Tentionmaru.
He can lose limbs only to grow them back later, etc. He was temporarily defeated by Tentionmaru.
Immortalis in Obliteration