Liu Yiwu  is a Chinese officer in Annex I. He was appointed as the leader of the Sino-Asian Squad #4 when they crashed on Mars. Liu is a very tall man with black hair and a large beard. He has black eyes and always wears glasses.
While at first he was the least characterized officer in the Annex, usually staying in the background and not standing out too much (despite being the tallest person in the Annex), after his betrayal was exposed, he revealed his confident and ruthless personality. He has shown to be tolerant of his subordinates minor blunders (such as Hong's), but he also has showed respect to a fallen adversary (Alexander Asimov).
Liu was born in a less-affluent, abandon area but despite this he entered the military after graduating at the top of his college class thanks to his hardworking attitude and connections. At the age of 24 he married the daughter of a high official and after his hard work in the army he was chosen for the Annex Project. It is revealed later that Zhang Ming-Ming was his crush and childhood friends.
Liu is an officer and also be considered one of the strongest members of Annex I despite his low M.A.R.S Ranking. After receiving his M.O. Operation Liu gained the powers and abilities of the blue-ringed octopus, allowing him to make use of the extremely potent tetrodotoxin which causes paralysis. He can disperse it into the air as poison gas, but also use it as a painkiller and a way to boost and encourage regeneration in his body. He has multiple muscular tentacles, which allow him to also use to fight and restrain enemies. He can regenerate his tentacles if they are lost in battle.

During the 21st century, humanity attempted to colonize Mars by sending two species which could endure the harsh environment of the planet to terraform it—algae and cockroaches. However, they did not anticipate the species' remarkable ability to adapt. Now in the 26th century, a lethal disease known as the Alien Engine Virus has arrived on Earth, and the cure is suspected to be found only on Mars. The problem is, Mars in the present is overrun by creatures known as "Terraformars," incredibly powerful and intelligent humanoid cockroaches that mutated from those originally sent to the planet. 

The Annex I team, consisting of a hundred men and women genetically enhanced with characteristics of powerful organisms from earth, has been sent to Mars on a mission to find the cause of the Alien Engine Virus and to help cure humanity—signalling the start of the crew's fight for survival.

After humanity’s first manned mission to the Red Planet was lost, a second expedition arrives. The explorers prepare to exterminate the cockroaches that were used to transform the Martian environment, but are shocked to discover that the insects have mutated into giant, aggressive humanoids with one overriding goal—exterminate the humans! However, this crew of explorers has each undergone the “Bugs Procedure,” terrifying experimental surgery designed to make them more than human…
 
(Source: Viz Media)

The second season of Terra Formars. 
 
In Terra Formars Revenge, the crew members of the Annex I continue to fight against Terraformars—the large humanoid cockroaches that evolved from the ones sent to Mars centuries ago. However, far from discovering the cure for the lethal Alien Engine Virus that has been plaguing Earth, the Annex I team have learned that some squadrons have agendas from their own countries. Now, the squadrons must not only fight against the Terraformars for their survival, but also each other in the never-ending battle for international dominance.