Since Solid Snake is different in Ac!d and Ac!d 2, tropes that apply to these version of Solid Snake only should be listed here.For other characters in the franchise, see the Metal Gear character index at Characters.Metal Gear.
Characters that debuted in Metal Gear Ac!d and Metal Gear Ac!d 2:
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Solid Snake (Ac!d portrayal)
An Alternate Universe counterpart of Solid Snake who brought down Outer Heaven and Zanzibar Land as usual, but permanently retired to Alaska afterward and is only called back to infiltrate Lobito Physics and Chemistry Lab after a 17-year absence. Conjecture on Metal Gear Wiki indicates that having not participated in the events of the Solid games (if their events existed beyond the Ac!d continuity's card packs), this iteration of Snake is more trusting of his allies and less concerned about unnecessary violence.
Creepy Twin marionettes Elsie and Francis. However, her team is killed save for herself and Snake is sent in to rendezvous with her and complete the mission. Depending on how far you are in Ac!d, Teliko may or may not actually be La Clown, a renowned disguise artist of completely unknown true identity and/or gender looking to convince Snake that he was really Fleming's right hand man Hans Davis the whole time.
Snake's CO for the events of Metal Gear Ac!d, who served alongside Roy Campbell in the Green Berets and shares the rank of Colonel. Troubled by his decisions in Vietnam, he struggles to maintain his faith in Snake as his personality conflicts more and more with that of BEAGLE bigshot Hans Davis.
Commander of a private army that storms Lobito Island at the same time that Teliko's team is sent in, also seeking Pythagoras and Fleming. Wields a PTRS-1941 anti-tank rifle single-handed thanks to his immense size. After a crazy boss fight and Snake's rendezvous with the real Teliko, Leone collaborates with Snake to get ahold of Fleming, but is captured and doped up with ACUA for the rematch. Leone is also formerly known as Jeff Jones, a member of Roger's unit in Vietnam who was falsely accused of spying for Charlie.
A young but renowned psychic detective working alongside Roger as Snake's Mission Control in Ac!d. While easily offended by Snake's skepticism, her abilities prove useful in finding escape routes and weapons at critical moments. At the same time, she attempts to walk a passenger of the hijacked airliner, Minette, through defusing the bomb in its cargo hold. Due to the Mind Screw nature of Ac!d's end-game reveals, Alice is actually a product of William Fleming and Hans Davis's experiments with Child Soldiers and may be either No. 16 (the survivor of the children's final, Deadly Graduation ritual), No. 104 (No. 16's final victim, who turned into a cloud of white dust and assimilated No. 16), or some combination of the two. Either way, she's been doing just enough to support the theory that Snake may actually be Hans Davis (though he really isn't) to make him personally loyal to her via the CHAIN system (the in-game justification for the trading-card-based movement and combat system).
A researcher on William Flemming's team on Lobito Island, he managed to escape the transfer of the rest of Flemming's unit to the FAR portion of the compound, but wound up cornered in a security office during the invasion by Leone's unit. After being rescued by Snake, he collaborates with the good guys via CODEC to help retrieve the Pythagoras data. Is actually William Flemming himself, looking to use Snake's delusions of the Hans Davis personality to recover the Pythagoras data, use it to activate Metal Gear KODOQUE, and get revenge on BEAGLE for using his daughter Constance (brainwashed into thinking of herself as Minette...or so BEAGLE's agents thought) as a motivational hostage.
The corporate conglomerate formerly in control of Lobito Physics and Chemistry Lab, infamous for its efforts to simultaneously perpetuate conflicts in third-world countries and deliver humanitarian aid to those affected by the pocket wars. Its name is supposed to be a Meaningful Acronym of the first names of its six proprietors, but the only one relevant to the plot of Metal Gear Ac!d is the second E, Emilio - a suspected alias for Hans Davis, right-hand man of William Fleming. Among their most prominent products are Super Soldiers (child or otherwise), Metal Gear KODOQUE, and NEKAL Silk Powder, a weight-control supplement which Alice/No. 16 and/or 104 has been using to spread the thought-suppressing drug ACUA into the general public.
Snake (Ac!d 2 portrayal)
An amnesiac found in the Serena Republic three years ago by a band of mercenaries, with no recollection of his past save answering to the name of the legendary soldier. After embezzling 15 million dollars from Serena's General Escobar and being framed for the death of Secretary of State Perez, Snake and his newfound friends try to smuggle themselves into America, but are arrested by Dalton. Dalton arranges a plea bargain with Snake: assist him in recovering incriminating data from the military company SaintLogic, and he and the gang can avoid being extradited back to Serena's judicial system. Snake's mission, of course, gets much more complicated than that as SaintLogic's new Metal Gear and its creator go rogue. This particular Snake is actually a SaintLogic-made clone of the real deal, using bits of Solid's genetic material recovered alongside Metal Gear KODOQUE following Ac!d 1.
An ex-FBI agent who convinces Snake to make an extraction run on SaintLogic in exchange for his mercenary team's freedom. Originally ousted from the FBI due to his obsession with SaintLogic's purchases of third-world children for their Super Soldier experiments, he seeks to expose their records to the world and bring their corruption to light. Dalton's investigation quickly gets sidetracked, however, when SaintLogic goes into lockdown to recover their Metal Gear and his authority is superseded by General Wiseman.
A Department of Defense representative who takes over Dalton's strike at SaintLogic when their top researcher, Dr. Kopplethorn, demands a laundry list of military and corporate bigwigs in exchange for not hitting things with his new Metal Gear's neutron bombs. Wiseman suggests that Snake team up with his own infiltrator, Venus, who was sent in to recover the Lucinda File. Wiseman is actually gunning for the Lucinda File to cover up his involvement in, or more accurately, that he instigated, the Praulia Massacre, an incident three years ago when Snake had to stop SaintLogic's last batch of Super Soldiers from going berserk.
A mysterious hacker who found his way onto Snake's CODEC frequency. Revealing his existence to Snake and Dalton, but not to Wiseman, he does sideline research into the Lucinda File and the reasons behind its classification while supplying Snake with a random rotation of nanochip expansions (the new justification for the card-based action of Ac!d 2). Wiseman eventually traces B.B. - short for Blackboard - to an elementary school in Virginia, but not quickly enough to stop him from alerting the U.S. President to the true scope of SaintLogic's depravity.
General Wiseman's agent within SaintLogic, sporting shoulder-holstered shuriken, a chest designed by Team Ninja, and even fewer reservations about killing than Snake. As the two begin working together, Venus reveals that Wiseman promised her assistance with recovering her own memory, much like Snake's been searching. Of course, being a Model 3 just like Snake, she doesn't have far to look. Unlike Snake, though, she's been aware of this the whole time and collaborating with Wiseman on orders.
Dr. Thomas Kopplethorn
Head scientist at SaintLogic and creator of Metal Gear Chaioth Ha Qadesh (or maybe "Kadosh", don't ask, it's Gratuitous Hebrew) and its "EGO System" OS. Upon Snake's arrival at SaintLogic's compound, he issues an ultimatum calling for the heads of several military, political, and financial figures - otherwise, his giant robot starts shooting. Ultimately meets his end at the hands of Lucy, the clone of his dead wife cultivated to govern the EGO System. Strangely enough, a "Dr. Kopplethorn" has been cited several times in previous Metal Gear games, most prominently lending his name to the VR generator that brings Gurlugon to life in MGS2 Substance's "Snake Tales."
A shy little girl found in the care of Dr. Michiko Takiyama, one of Kopplethorn's assistants. Snake and Venus save the two from rampaging security robots, but a preemptive attack on the railway to Metal Gear's hangar forces them into Kopplethorn's hands. Takiyama's comments that Lucy "has only been given a fragmented ego" betray the fact that Lucy was created from the remains of Kopplethorn's wife Lucinda to command the EGO System. However, Kopplethorn's experiments in implanting a nanochip expansion system into Lucinda's brain overwrote the original ego, creating a hybrid personality that manipulated Kopplethorn into letting her bond with Metal Gear CHQ by playing along as a regular memory clone of Lucinda.
SaintLogic's CEO, forced into hiding by Kopplethorn's revolt. As the threads connecting the people Kopplethorn has demanded are followed, Rodzinski orders the company's security forces to eliminate him and forges a plea bargain with the International Criminal Court to drop various charges against SaintLogic in exchange for the Lucinda File and Kopplethorn's detainment. The ICC reneges on the deal at the last minute, and Rodzinski is shot down at the dying order of security chief Vince as he attempts to flee arrest.
SaintLogic's Chief of Security. He had runins with Snake and Venus in order to impede their progress, as well as keep the situation at SaintLogic under wraps. Eventually, he is defeated by Snake, and then has his forces evacuate, as well as Rodzinski shot down by his forces as payback for attempting to abandon them on the island to force them to take the blame.