Loki

* Absorbing Man - Loki created Absorbing Man by giving him enhanced water (Journey into Mystery #114), later he serves Loki (JIM #122-123)
* Ancient One - Loki hears Doctor Strange use Ancient One's name (Strange Tales #123)
* Ant-Man - *Enemy:* archenemy of Avengers (from #1)
* Apocalypse - they clash in Himalaya when Loki attempts to recruit him for Acts of vengeance (X-Factor #50)
* Aurora - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Balder - half-brother. Nickname: "Snivelling Balder" (Thor #147)
* Beta Ray Bill - they have crossed paths
* Caliban - they clash in Himalaya when Loki attempts to recruit Apocalypse for Acts of vengeance (X-Factor #50)
* Cannonball - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Charles Xavier - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Cobra - Loki enhances the powers of Cobra and Hyde to have them defeat Thor (#110)
* Colossus - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Cyclops - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Doctor Strange - *Enemy*: Loki contacts Strange to get help to defeat Thor, but they end up in mortal battle (Strange Tales #123)
* Dormammu - Loki hears Doctor Strange use Dormammu's name (Strange Tales #123)
* Doug Ramsey - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Enchantress - Loki gets her to seduce Thor (Journey into Mystery #103), and they have since hatched many other ill deeds together (e.g. JIM #116). Nickname: "My Lovely One" and "My Beatiful One" (JIM #103), "Sweet One" (New Mutants SE)
* Executioner - Loki manipulates Executioner to attack Thor (Journey into Mystery #103), and they have done other ill deeds together (e.g. JIM #116)
* Fandral - fellow asgardians, journeys together (since Journey into Mystery #119), as well as enemies. Nicknames: "Reckless One" (Thor #176), "Accursed Warrior" (#191)
* Frigga - foster mother
* Galactus - Loki mentions Galactus in his negotiations with Silver Surfer (SS #4)
* Grand Vizier - fellow Asgardians / enemies
* Heimdall - fellow asgardian
* Hela - Loki grudgingly assists in twarting Hela (Thor #188), but then goes and betrays Thor to her (#189). Nickname: "Awesome Hela" (Thor #189)
* Hercules - Loki considers if he could use Hercules as assassin against Thor (Silver Surfer #4)
* Hogun - fellow asgardians, journeys together (since Journey into Mystery #119), as well as enemies
* Hulk - *Enemy:* they battled in beginning of the Avengers (A #1), later Loki manipulates Hulk to attack Asgard (Tales to Astonish #101)
* Human Torch - Loki has studied the Fantastic Four from afar (Thor #142)
* Iceman - *Enemy*: Loki holds Iceman captured in Asgard (Thor #378)
* Iron-Man - *Enemy:* archenemy of Avengers (from #1)
* Jane Foster - *Enemy*: Loki manipulates her to strike Thor (Journey into Mystery #88), captures Jane several times (#108, 114)
* Karma - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Karnilla - sometimes fragile allies in mischief (since Journey into Mystery #107 and Thor #150). Nicknames: "My Lovely One" (JIM #117), "Enchanted One" (Thor #151, 167)
* Madelyne Pryor - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Magik - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Magma - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Mephisto - Loki in a vision observes how Mephisto approached Silver Surfer (SS #4), and they are distanced allies when Loki has swapped body with Thor (Thor #180-181)
* Mirage - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Mister Hyde - Odin tells Loki about Thor battling Hyde (Journey into Mystery #101), and then Loki enhances the powers of Cobra and Hyde to have them defeat Thor (#110)
* Nightcrawler - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Northstar - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Odin - Loki is Odin's foster-son. Nicknames: "Imperial One" (Journey into Mystery #117), "Venerated Sire" (Thor #147)
* Puck - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Rachel Summers - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Reed Richards - Loki has studied the Fantastic Four from afar (Thor #142)
* Rick Jones - *Enemy:* conflict through Hulk (e.g. Avengers #1)
* Rogue - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Sasquatch - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Shadowcat - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Shaman - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Sif - fellow gods and adversaries (since e.g. Thor #150). He demands to marry her (#192-193). Nickname: "Beauteous One" (Thor #191), "Fair Sif" (#192-194), "Mi'Love" and "My Lovely" (#193)
* Silver Surfer - they clash as Loki tries to get Silver Surfer to attack Thor (SS #4). Nicknames: "Lowly One" and "Space Wanderer" (SS #4)
* Snowbird - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Storm - *Enemy:* Loki gets her abducted and enchanted in Asgard (X-Men An. #9). Nickname: "Wind-rider" (Xm Ann. #9)
* Sunspot - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Super-Skrull - Loki manipulates him into attacked New York (Thor #142)
* Susan Richards - Loki has studied the Fantastic Four from afar (Thor #142)
* Talisman - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* The Thing - Loki has studied the Fantastic Four from afar (Thor #142), and considers The Thing as an assassin (Silver Surfer #4)
* Thor - foster brother and nemesis. Nicknames: "Hated One" (Journey into Mystery #88), "Accursed One" (Thor #153, 181), "Accursed Thunder God" (#176), "Doomed One" (#181), "Accursed Brother" (#191, 192), "Witless Clod" (#192), "Beloved Half-brother" and "My Histrionic Friend" (#207)
* Ulik - Loki witnesses the battle of Ulik and Thor in Karnilla's realm (Thor #152)
* Vindicator - they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2)
* Volstagg - fellow asgardians, journeys together (since Journey into Mystery #119), as well as enemies
* Warlock - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Wasp - *Enemy:* archenemy of Avengers (from #1)
* Wolfsbane - *Enemy:* Loki manipulated and battled the New Mutants (X-Men An. #9)
* Wolverine - *Enemy:* they clash in the "Loki's gift" adventure in Canada (X-Men/Alpha Flight #1-2) and in Asgard (X-Men An. #9)
* Wrecker - they meet in Manhattan and Wrecker by accident gets Lokis powers (Thor #148)