Not much is known about Sulik, apart from what little he tells to the Chosen One. He says that he is from a primitive village located by the 'Great Salt Water' which could either refer to the sea or the Great Salt Lake in Utah, and has come in search of Kurisu, his sister who he thought was captured by slavers.
The large bone driven through his nose he calls 'Grampy Bone'. It is connected to the tribal lore of his family and village; through it he is able to speak to his grandfather and other important dead spirits of his tribe, who give him advice, cryptic as it may be.
If asked about his sister, Sulik says "sis gone trading another village and never come back". Upon further questioning, he divulged that when he investigated, he found "One survivor. Dude was in bad shape. Said evil warriors with magic torches came. Fire would lick tribe warriors and they'd go to the spirit. [...] The evil warriors tied up the rest and took off. Sis with 'em. Fren, we be find her or dying trying." The description is remarkably similar to that of Hakunin's upon the assault on Arroyo by Enclave soldiers. It is possible that this village was raided by the Enclave as well, snatching captives for experimentation with the weaponized FEV.
At the beginning, Sulik requests that the Chosen One help him find his sister; the trail leads to the slaver Metzger, but Sulik's sister is not found.
The player can ask Sulik to "consult the spirits" for advice on their current quests and their current location. Sulik will provide poetic yet nebulous phrases, though they are rarely helpful as actual advice they do provide insight. For example, when the Return Anna's locket quest is active, Sulik says of the ghost "Hey! They say another bonespirit's here. Needs help." Furthermore, when searching for Vault 13 and in NCR he says "What you seek is not here. The path to that is". Some of this advice is not place- or quest-dependent, and can be heard anywhere, although they are more philosophical than useful.
Sulik will leave the player or refuse to join them based on the following:
Won't join or rejoin the team if the player's town reputation in Klamath is Hated or lower.
Will leave the party if the player becomes a Childkiller or Berserker or the Chosen One's Karma becomes -101 or lower.
Will attack you if you decide to join the slavers.
Will attack if you attack anyone in Klamath, even the nefarious Dunton brothers.
There are two ways to recruit Sulik without paying the $350. Completing the Rescue Smiley the Trapper quest is uncomplicated but involves either sneaking past or fighting golden geckos. Completing the Rescue Torr quest requires killing the robot run amok, and has the prerequisite of completing the quest Rustle the brahmin, which has the prerequisite of -starting- the quest Guard the brahmin. It is possible to complete both of these latter quests.
Sulik will join the player's team even if they are playing an character with an Intelligence less than 4. At first, he will make fun of the Chosen One, talk about a big hole in your head, but then he will join. The player must have $350 when he attempts to recruit Sulik, as there is only one shot at recruiting him through the dialogue combinations. Either way, Sulik makes a poor recruit for low Intelligence characters due to communication problems (e.g. he cannot be ordered to wait or put away his weapon through dialogue).
Sulik prefers to fight with melee weapons, and joins the player with a sledgehammer. At his maximum level he has 13 Action Points, the highest of all recruitable non-player companions that can use firearms. At this point, if given a Super sledge Sulik can attack four times a round if he does not knock the opponent back at first. But when range is an important issue, his high Action Points are best utilized by giving him a .223 pistol, allowing up to two attacks per round, and enough extra points to reload or move a small distance. The .233 pistol is the only non-SMG pistol Sulik can use, as NPCs are able to use weapons they are programmed with animations for, and the .233 pistol uses the SMG animation. This also means that although Sulik has skill in Throwing, he cannot use grenade-type weapons because he does not have the animations for them. When armed with SMGs, Sulik is a powerful ally in combat, able to use top-tier guns such as the H&K G11E and H&K P90c to devastating effect, but the player should be wary that his bursts are quite hazardous to themselves and other companions.
As a human companion, Sulik is able to wear Power armor and its variants.
Primary leveling skill: Melee Weapons.
Leveling skills: Small Guns, Unarmed, Throwing, Outdoorsman.
Sulik was designed by Fallout 2 lead designer Matt Norton.
Sulik returned to the primitive tribe for a few moons (months) after breaking paths with the Chosen One, then headed east in search of his sister. It is left open for future games and fan opinion to close out Sulik's story and decide whether the story of Kurisu, told in Van Buren, is part of it.