Forge

* Abigail Brand - she kills Forge from her space station in Ast X-Men #3.30
* Amanda Sefton - they join forces against the Dire Wraiths (#188) and in the Muir Island battles (#254-278)
* Angel - Forge helps save Angel from vampires (X-factor #58), and they join forces against Ahab from the future (X-Factor An. #5), X-Men members (from U X-Men #280)
* Armor - they clash in Forge's lair in Ast X-Men #3.29-3.30
* Artie Maddicks - they meet at the wedding of Jean and Scott (X-Men #2.30)
* Aurora - Forge knows about Aurora through Wild Child (X-Factor #136)
* Avalanche - they meet in Dallas after the Fall (X-Men #227), join forces in the Muir Island battle (X#255)
* Banshee - members of X-Men together (from #254)
* Beast - they meet after the battle of Ship (X-Men #264), then join forces against Ahab from the future (X-Factor An. #5) and in Extinction Agenda (New Mutants #97), X-Men members (from #280)
* Bishop - members of X-Men (from XM #287)
* Blob - they meet in Dallas after the Fall (X-Men #227), and join forces in the Muir Island battle (#255)
* Boom-Boom - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5) and in the X-Tinction event in Genosha (Uncanny X-Men #272)
* Cable - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5) and in Genosha (X-Men #272), and meet again at the wedding of Havok and Polaris (#425)
* Callisto - they join forces against Masque (X-Men #263) and Genoshans (#264)
* Cannonball - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5) and in the X-Tinction event in Genosha (X-Men #272)
* Captain Britain - team Excalibur discuss Forge in their headquarters (#86)
* Carol Danvers - she hears about Forge in X-Men #269
* Celeste Cuckoo - they possibly meet at the wedding of Havok and Polaris (X-Men #425)
* Charles Xavier - X-Men members together (from #277)
* Ch'od - Starjammers were rescued from The Host by The Uncanny X-Men (#277)
* Colossus - allies many timew since they first join forces against Dire Wraiths (X-Men #185-188)
* Corsair - Starjammers were rescued from The Host by The Uncanny X-Men (#277), and they meet again at the wedding of Havok and Polaris (X-Men #425)
* Crystal - they meet at the wedding of Jean and Scott (X-Men #2.30)
* Cyclops - Forge first hears Madelyne mention Scott (X-Men #227), they save Angel from vampires (X-factor #58), join forces against Ahab from the future (X-Factor An. #5), later X-Men members (from XM #280)
* Dazzler - Forge sacrifices all the X-Men in The Fall (#227)
* Domino - they meet at the weddings of Jean and Scott (X-Men #2.30) and Havok and Polaris (#425)
* Emma Frost - they join forces in (X-Men #281-282), also possibly meet at the wedding of Havok and Polaris (#425), but clash in Forge's lair in Ast X-Men #3.29-3.30
* Franklin Richards - they meet as heroes battle against Ahab from the future (X-Factor An. #5),
* Galactus - Forge speaks to the X-Men of the "creature who eats planets" (X-Men #2.3)
* Gambit - they join forces against Ahab and his hounds (X-Men An. #14), in Extinction Agenda (New Mutants #97), then members of X-Men together (from XM #273)
* Gladiator - they battled in the cosmos in Uncanny X-Men #275
* Glob Herman - they possibly meet at the wedding of Havok and Polaris (X-Men #425)
* Havok - Forge sacrifices all the X-Men in The Fall (XM #227), foes but then allies in X-Tinction in Genosha (#270-272), and members of X-Factor (until XF #117)
* Henry Gyrich - Forge is there when Gyrich attacks Rogue and Storm (X-Men #185), later they work together (#299)
* Hepzibah - Starjammers were rescued from The Host by The X-Men (#277), and they meet again at the wedding of Havok and Polaris (#425)
* Human Torch - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5)
* Husk - they meet at the wedding of Havok and Polaris (X-Men #425)
* Iceman - they save Angel from vampires (X-factor #58), also join forces against Ahab from the future (An. #5), and then X-Men members (from XM #280)
* Iron-Man - Forge talks about Tony Stark in X-Men #184
* Jean Grey - they join forces against Ahab from the future (X-Factor An. #5), then X-Men members (from XM #263). Nickname: "Red" (X-Men #2.3)
* Jubilee - they are allies in Extinction Agenda (New Mutants #97), then members of X-Men together (from XM #273)
* Juggernaut - they meet at the wedding of Havok and Polaris (X-Men #425)
* Kid Omega - they possibly meet at the wedding of Havok and Polaris (X-Men #425)
* Lady Deathstrike - *Enemy:* the battle of Muir Isle (X-Men #255)
* Leech - they meet at the wedding of Jean and Scott (X-Men #2.30)
* Lilandra - they join forces against Skrull impostors (Uncanny X-Men 275-277)
* Longshot - Forge sacrifices all the X-Men in The Fall (#227)
* Luna Maximoff - they meet at the wedding of Jean and Scott (X-Men #2.30)
* Madelyne Pryor - Forge sacrifices her and all the X-Men in The Fall (#227)
* Magik - after The Fall Magik challenges him in a battle in Limbo (New Mutants #65-66)
* Magneto - *Enemy:* with X-Men (#2.2-3) - *Ally:* they meet on Muir Isle (X-Men 253)
* Meggan - team Excalibur talk about Forge in their headquarters (#86)
* Mindee Cuckoo - they possibly meet at the wedding of Havok and Polaris (X-Men #425)
* Mirage - the New Mutants witness the battle of Magik and Forge (New Mutants #65-66), later they meet at the wedding of Havok and Polaris (X-Men #425)
* Misty Knight - Forge designed her artificial arm (Mentioned in X-Men #264)
* Moira MacTaggert - they joined forces in the Muir Island battles (X-Men #254-280) and later she supports the X-Men (from #2.1)
* Multiple Man - they were in the Muir Island Saga (X-Men #280) and meet again through X-Factor (#129) and at the wedding of Havok and Polaris (X-Men #425)
* Mystique - apparently they knew each other from before as they start a cooperation in X-Men #184, also join forces in the Muir Island battle (#254-280) and later members of X-Factor. Sweethearts (from X-Factor #136)
* Nick Fury - in a flashback from Vietnam, it is seen that a recruiter mentioned Fury (X-Men #262), much later X-Men and SHIELD join forces (XM #2.2-3), and they both serve in the Commission on Superhuman Activities (X-Force #27-28)
* Nightcrawler - they meet at wedding of Jean and Scott (X-Men #2.30) and several times through the X-Men (e.g. X-Factor #108, X-Men #2.103). Nickname: "Fuzzy" (#188)
* Northstar - they meet at the wedding of Havok and Polaris (X-Men #425)
* Phoebe Cuckoo - they possibly meet at the wedding of Havok and Polaris (X-Men #425)
* Polaris - allies in the Muir Island battles (X-Men #254-280) and then members of X-Factor
* Psylocke - Forge sacrifices the X-Men in The Fall (#227), allies in Extinction Agenda (New Mutants #97), then members of X-Men together (from XM #273)
* Pyro - they meet in Dallas after the Fall (X-Men #227), join forces in the Muir Island battle (#255), but later Pyro is arrested by X-Factor (#130)
* Quicksilver - members of X-Factor
* Rachel Summers - they join forces against Ahab and his hounds (X-Men An. #14), and also meet at the wedding of Jean and Scott (X-Men #2.30)
* Raza - Starjammers were rescued from The Host by The Uncanny X-Men (#277)
* Reed Richards - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5)
* Rictor - they are allies in the X-Tinction event in Genosha (Uncanny X-Men #272)
* Rogue - they join forces against Dire Wraiths (X-Men #185-188) and in The Fall (#227), later members of X-Men together (from #273)
* Roma - they meet in her palace in The Fall (X-Men #227), also allied later (X-Factor #118)
* Sabretooth - members of X-Factor (#123-136)
* Scarlet Witch - they meet at the wedding of Havok and Polaris (X-Men #425)
* Selene - *Enemy:* Selene plots against the X-Men (U X-Men #283)
* Shadowcat - they meet at the wedding of Jean and Scott (X-Men #2.30)
* Sharon Ventura - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5)
* She-Hulk - in Uncanny X-Men #272, Jennifer seeks to represent the mutants in the Genosha trials
* Siryn - they battled in the Saga of Muir Island (U X-Men #280)
* Spider-Man - Forge speaks to the X-Men of the "guy who sticks to walls" (X-Men #2.3)
* Spiral - they meet in Dallas after the Fall (X-Men #227)
* Storm - long love-hate relation since he was involved in her getting shot (X-Men #185) after which they spent time together in his tower in Dallas, later X-Men together. Nicknames: "Wind-rider" and "Sweetheart" (#226), "Boss Lady" (#2.3)
* Strong Guy - allies several times (U X-Men #278-295) and then members of X-Factor
* Sunfire - they join forces in U X-Men #284
* Sunspot - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5) and in the X-Tinction event in Genosha (X-Men #272)
* Susan Richards - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5)
* Tessa - Tessa stayed some time with Forge and the X-Men
* The Thing - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5)
* Trish Tilby - Beast mentions Trish when they are in the Ship (X-Men #264)
* Valerie Cooper - they start their cooperation under CIA (from X-Men #184), and Valerie later brings in Forge to handle X-Factor (from #93)
* Warlock - they join forces to battle Ahab from the future on Liberty Island (X-Factor An. #5)
* Wild Child - members of X-Factor
* Wolfsbane - the New Mutants witness the battle of Magik and Forge (New Mutants #65-66), later members of X-Factor
* Wolverine - Forge sacrifices all the X-Men in The Fall (#227), allies in Extinction Agenda (New Mutants #97), then members of X-Men together (from XM #273)