Martians, a functionally (not) extinct sapient species formerly found on Mars. Capable of vast Bio-Materiokinesis and Mentakinesis, Martians can shapeshift on molecular level and alter their body density, have ability to read minds, can regenerate from severed body parts, and are on pair with Kryptonians in terms of physical characteristics. Their only weakness is fire, that can strip them of their powers and liquefy them, as well as induce fear in their hearts.
Red Lanterns, rage-based variant of Lantern Corps. Aside from standard Lantern energy constructs, they also have Hematokinesis (Blood Manipulation) and can spit acidic napalm that can burn in space and incinerate New Gods. Disadvantage of their membership is that their hearts and blood are replaced by energy within the ring, meaning that removing it would result in their death.
So, now that both parties have been introduced - what would happen if Martian acquired Red Lantern Ring? Would he like, get set on fire and die instantly? If they could wear and use it, would removing it result in their death, considering that they appear to have no organs due to amorphous physiology? How would Ring's rage inducement affect their mental powers?