Longshot

* Angel - they join forces during Inferno (X-Men #242-243)
* Avalanche - their teams join forces in The Fall in Dallas (X-Men #225-227)
* Banshee - Longshot stays on Muir Isle for a period (X-Men #216-221)
* Beast - they join forces during Inferno (X-Men #242-243), and in Mojoverse (#2.10)
* Black Knight - Longshot and Psylocke watch the Avengers in Paris on TV (XM vs A #4)
* Blob - their teams join forces in The Fall in Dallas (X-Men #225-227)
* Cable - Longshot must have heard about baby Nathan from Madelyne (around X-.Men #223), and the X-Men save him in Inferno (#242-243)
* Captain America - Longshot and Psylocke watch the Avengers in Paris on TV (XM vs A #4)
* Captain Britain - Cap fights an impersonation of Longshot in Excalibur #19, but it is actually Meggan
* Callisto - they go to live on Muir Island together (from X-Men #215)
* Cannonball - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Captain Britain - Brian and Meggan are house guests with the X-Men (An. #11)
* Carol Danvers - the X-Men see the Danvers persona present in Rogue (#238)
* Charles Xavier - Longshot must have heard of him after he moved in with the X-Men (#214), later they join forces in Mojoverse (X-Men #2.10)
* Cobra - *Enemy:* Diamondback tells the X-Men about him, and they battle his lackeys (Annual #13)
* Colossus - they joined forces against Mojo (X-Men An. #10), later X-Men members (from #225)
* Cyclops - Longshot first hears the X-Men talk about Cyclops (#221), they join forces during Inferno (#242-243), and in Mojoverse in X-Men #2.10
* Dazzler - X-Men members (from #214), romantic interest (from #220), lovers (An. #12)
* Diamondback - she stayed a while with the X-Men in Australia (Annual #13)
* Doctor Doom - they work together in Latveria for the sake of Shadowcat (FF vs X-Men #3-4)
* Doctor Druid - Longshot and Psylocke watch the Avengers in Paris on TV (XM vs A #4)
* Doug Ramsey - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Forge - Forge sacrifices all the X-Men in The Fall (#227)
* Franklin Richards - they meet in Latveria when Shadowcat is saved (FF vs X-Men #3-4)
* Gambit - they join forces in Mojoverse in X-Men #2.10
* Havok - X-Men members (XM #219-251)
* High Evolutionary - they work together to restore the Savage Land (An. X-Men #12)
* Hulk - Dazzler mentions Hulk to her teammates (X-Men #235)
* Human Torch - their teams butt heads over the fate of Shadowcat (FF vs X-Men #1-4)
* Iceman - they join forces during Inferno (X-Men #242-243)
* Jean Grey - they join forces during Inferno (X-Men #242-243)
* Jubilee - they join forces in Mojoverse in X-Men #2.10
* Juggernaut - they have a big brawl in Scotland (X-Men #218)
* Karma - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Lady Deathstrike - *Enemy:* Yuriko plots attack against the X-Men and takes over their HQ (#247-251)
* Madelyne Pryor - *Ally:* Maddie becomes part of the X-Men (#221-239) - *Enemy:* throughout Inferno (#242-243)
* Magik - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Magma - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Magneto - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Meggan - Brian and Meggan are house guests with the X-Men (An. #11)
* Mirage - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Mister Sinister - *Enemy:* the pantheon of mutants defeat Sinister after Inferno (X-Factor #39)
* Moira MacTaggert - Longshot stays on Muir Isle for a period (X-Men #216-221)
* Monica Rambeau - Longshot and Psylocke watch the Avengers in Paris on TV (XM vs A #4)
* Mystique - their teams join forces in The Fall in Dallas (X-Men #225-227)
* Multiple Man - Longshot stays on Muir Isle for a period (X-Men #216-221)
* Nightcrawler - they joined forces against Mojo (X-Men An. #10)
* Polaris - *Enemy:* with Malice, Lorna leads the Marauders against the X-Men (#221-243)
* Psylocke - X-Men members (from #215)
* Pyro - their teams join forces in The Fall in Dallas (X-Men #225-227)
* Reed Richards - their teams butt heads over the fate of Shadowcat (FF vs X-Men #1-4)
* Rogue - X-Men members (from #215)
* Roma - Roma sends the nine X-Men from her castle to Australia (#227-229)
* Sabretooth - *Enemy:* their teams clash in San Francisco (X-Men #222) and during Inferno (#240-243)
* Sebastian Shaw - *Enemy:* Shaw plans attacks against the X-Men in #247
* Shadowcat - they joined forces against Mojo (X-Men An. #10), and he bring the ghostly Shadowcat to Muir Island (#215)
* She-Hulk - their teams butt heads over the fate of Shadowcat (FF vs X-Men #1-4)
* Siryn - they may have met when Longshot stays on Muir Isle for a period (X-Men #216-221)
* Spiral - they lived together in Mojoverse, and join forces in The Fall in Dallas (X-Men #225-227)
* Storm - X-Men members (from #215)
* Sunspot - brief residents of the X-Mansion (around X-Men An. #10)
* Susan Richards - their teams butt heads over the fate of Shadowcat (FF vs X-Men #3-4)
* The Thing - their teams butt heads over the fate of Shadowcat (FF vs X-Men #1-4)
* Thor - Longshot and Psylocke watch the Avengers in Paris on TV (XM vs A #4)
* Warlock - brief residents of the X-Mansion (around X-Men An. #10)
* Wolfsbane - brief residents of the X-Mansion (An. #10 - X-Men #221)
* Wolverine - X-Men members (from #215)