GTA with Assassin's Creed mod in it, it's not really suitable. Looks weird while playing games that have modern life background, combined with some characters or models from the medieval era. But that's the mod. Anything can.
If you want more serious, it is possible to change the whole environment of San Andreas to the ancient city of Jerusalem, Masyaf, and others. Back in the Third Crusade era, when the main character of this game, Altair, life.
Altair himself is controversial and debatable character. Altair’s name is Altaïr Ibn-La’Ahad (الطائر ابن لا أحد in Arabic = The Flying Eagle, Son of None) (born 1165). He was an Assassin during the time of the Third Crusade and later Grand Master of the Assassin’s Order. An ancestor to both Ezio Auditore da Firenze and Desmond Miles, Altaïr was raised to be an Assassin from birth; obtaining the rank of Master Assassin by his twenty–fifth year. However, following his failure to obtain the Apple from Robert de Sable in 1191, and subsequently allowing Robert’s Knights Templar to attack the city of Masyaf, head quarters to the Order of Assassins, he was demoted to the rank of novice and sent on a quest for redemption.
Altair’s 3D model – that converted from the original game which developed by Ubisoft Montreal, first appear in Garry’s mod. I know some modder already show that model in T-pose, but deleted for some reason. I was too late to know about this, so to get the model my self, I using Turfster tool and some ripper program and release it for GTA San Andreas mod in January 2010.
I add some polygons to fix altair's head. The gang models created by replacing Altair's head with several heads of GTA main characters, like Niko Bellic, Carl Johnson and Tommy Vercetti.
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After Assassin’s Creed II released by Ubisoft, I try to mod the main character of this game, Ezio Auditore da Firenze, but with no luck. Eventhough, I have the Ezio model from Oblivion mod, but it came without Ezio head. It’s difficult for me to finish it, because I don’t have any suitable head model. So i released it for test only.
There is no need for me to fix it, because I have the original Ezio model from Assassin’s Creed II, recently. The new version of Turfster tool now have ability to read Assasin’s Creed II format (forge). If you lucky, you maybe will find Ezio in some websites. I already saw two Ezio in Garry’s mod. … For GTA San Andreas I still keep the Ezio mods my self for personal reason.
Assassin's Creed II is a third person action-adventure video game developed by Ubisoft Montreal and published by Ubisoft for the PlayStation 3 and Xbox 360 video game consoles, and Microsoft Windows. It is the second video game installment of the Assassin's Creed series and is a direct sequel to the 2007 video game Assassin's Creed. The game was released on video game consoles in November 2009, and released for Windows on 3 March 2010.
The game is set in 2012, with player-controlled protagonist Desmond Miles escaping from Abstergo Industries with an employee, Lucy Stillman, after being forced to relive the genetic memories of ancestral assassin Altaïr ibn La-Ahad through a machine known as the "Animus." After escaping from Abstergo, Desmond enters a device which is more advanced than the Animus and relives the genetic memories of ancestral nobleman Ezio Auditore da Firenze, who lived during the Renaissance period of the late fifteenth century in Italy. The player controls Ezio, who becomes an Assassin after his father and brothers are murdered by a traitor to the Auditore family. While controlling Ezio, the player can explore game renditions of Italian cities, regions and landmarks in open world gameplay. The gameplay is a mixture of action, stealth and platforming.