"G" was one of the main characters of the House of The Dead video game series. His real name, age and nationality are unknown (or is kept Top Secret).
It was hinted in the first game's manual that he is in fact a cyborg though the third game disproves this because of his aging (possible Sega just retconned the fact). James also notices G's blood stain in the corner of a street during the second game. For the moment, what G is is unknown but he is biological at the very least with his aging and bleeding. He also possesses a very "digital" personality in the first game, though by third game this seems to have disappeared and acts very much like an ordinary human. This may be because of experience in life or just another retcon.
Out of all the House of The Dead characters, G is the only one to have appeared in all of the games either as a playable character or just as a cameo. These are his appearances:
House of The Dead: As one of the two playable characters.
House of The Dead 2: Has a short appearance in the beginning by giving James his file containing enemy information.And in the normal ending, himself, Amy,Harry and the civilians are shown
House of The Dead 3: As one of the playable characters(Player 2, as Player 1 is either Thomas Rogan for Chapter 0 or Lisa Rogan for the rest of the game).
House of The Dead 4: Makes a short appearance in one of the endings.
House of The Dead 4 Special: As one of the two playable characters. His only role as Player One so far.
House of The Dead: Overkill: As one of the playable characters.
The House of the Dead
In 1998, G and his partner Thomas Rogan was sent to Curian's mansion to investigate after receiving telephone call from Sophie that was in distress (and was cut of). He and Rogan traveled through the mansion defeating hordes of evil undead. He and Rogan also defeated Chariot, a spear wielding armored zombie. Hangedman, a flying bird-like mutation. Hermit, a spider-like mutation and Curien's ultimate design, Magician.
The House of the Dead 2
In the year 2000, G was sent to investigate the CEO of DBR corporation Goldman. He set up a meeting with some fellow agents in a library however Goldman released his horde of undead before they could meet. G was injured in the process and was found by James and Gary in the library they were suppose to meet where G handed James his file containing data from his investigation. This file contained the weak points of some of the bosses that James and Gary would faced and more. He probably gathered them through his investigation or by battling down these bosses himself. He also made a incomplete sketch of The Emperor, probably as a result of his investigations.
The House of the Dead 3
During 2019, 16 years after the World Collapse, Lisa, Thomas Rogan's daughter seeks G out in order to help her search for her father. G agrees and they headed out to the DBR facility that Rogan's team headed. They encountered the huge Death a club-wielding security zombie. Sun a large tree like mutation with sharp vines, Fool a massive sloth-like mutant which attacked with its huge claws and eventually facing Curien's experimental mutation, the Wheel of Fate. Curien's son Daniel helped Lisa and G to destroy the program and Rogan was found.
The House of the Dead 4 / The House of the Dead 4 Special
Three years later, during the World Collapse (in House of The Dead 4 Special), G rescued Kate Green from a horde of zombies and they teamed up together to find "The Source" (it is unknown how he got across this information however) and they battle their way through the city into an underground laboratory with many farming pools for the undead. They faced a resurrected(or maybe cloned) Magician (Type 0) at the end.
In one of the House of The Dead 4 endings,G revisited the site where James sacrificed himself to defeat The World saying that he has found the Source. This scene is shown with his HoTD III model in Special (which is released after HoTD 4 and takes place only hours after), he is shown wearing his trademark suit. Sega probably retconned with Special that G was wearing his suit instead.
The House of the Dead: Overkill
G's first mission after graduating from the AMS academy is to investigate the mysterious disappearance of people in Bayou City in Louisiana. He teams up with Detective Issac Washington in this installment. In this game, his overall character has changed considerably (possibly because he's in his younger days. He still wears black clothing but now sports sunglasses. His personality is more snappy and his voice sounds a little deeper.