The X-Men (vol. 1) #34 (July 1967):
“War -- In a World of Darkness!”
by Roy Thomas, Dan Adkins

The X-Men (vol. 1) #34

Title: “War -- In a World of Darkness!”

Medium: comic

Cover date: July 1967

Publisher: Marvel
Written by: Roy Thomas
Art by: Dan Adkins

24 characters in this story:

(Click links for info about character
and his/her religious practice, affiliation, etc.)
Pub. #
Cyclops Cyclops (Scott Summers) hero
CBR Scale: SCBR Scale: I Protestant; mutant supremacist
Brotherhood of Mutant Supremacy; Summers Rebellion...  Marvel 8,371
The Beast The Beast (Hank McCoy) hero scientist
CBR Scale: ICBR Scale: S Episcopalian; agnostic
Academy of Tomorrow; Brotherhood of Mutants...  Marvel 5,233
Phoenix Marvel Girl (Jean Grey) hero
CBR Scale: I Episcopalian
Metro College; The Twelve...  Marvel 1,905
Iceman Iceman (Bobby Drake) hero
CBR Scale: I Jewish Catholic
Secret Defenders; Spider-Man and His Amazing Friends...  Marvel 1,752
Angel Angel (Warren Worthington III) hero
CBR Scale: I Episcopalian
Academy of Tomorrow; Horsemen of Apocalypse...  Marvel 1,741
Mole Man Mole Man (Harvey Elder) villain scientist
  [ruler of much of Subterranea] Marvel 297
Tyrannus Tyrannus (Romulus Augustilus) villain based on a real person
CBR Scale: U Greco-Roman Classical Religion
They Who Wield Power Marvel 56
Xavier Institute Xavier School for Gifted Youngsters supporting character group
  [high school] Marvel 373
Cobalt Man Ralph Roberts villain scientist
  Emissaries of Evil (Egghead) Marvel 9
Ted Roberts Ted Roberts supporting character
  Metro College
[Cobalt Man's brother; dated Jean Grey]
Marvel 9
Cerebro Cerebro villain
CBR Scale: I N.A.
[Xavier's mutant-finding machine, given sentience by Bastion] Marvel 9
Moloids Moloids (Subterraneans) villain group
CBR Scale: R Moloid religion
[hidden race] Marvel 37
Tyrannoids Tyrannoids supporting character villain group
CBR Scale: D Tyrannoid religion
[sub-species of Subterraneans] Marvel 11
X-Men X-Men hero group
  [1st app: The X-Men (vol. 1) #1 (Sep. 1963)] Marvel 9,958
Metro College Metro College supporting character group
  [college/university] Marvel 3
Roberts Research, Inc. Roberts Research, Inc. supporting character group
  [owned by Ralph Roberts (Cobalt Man)] Marvel 4
The Cobalt-Robot The Cobalt-Robot villain
CBR Scale: D N.A.
[built by Ralph Roberts when held captive by Tyrannus] Marvel 1
The Diamond Android The Diamond Android villain
CBR Scale: D N.A.
[warrior] Marvel 1
Carole Carole supporting character
  Metro College
[Jean Grey's roommate at Metro College]
Marvel 1
Changeling Changeling (Kevin Sydney)
(behind the scenes) 
  Factor Three; X-Men Marvel 23
Professor X Professor X (Charles Xavier)
hero scientist
CBR Scale: S religious
Brotherhood of Mutants; Genoshan Excalibur...  Marvel 4,999
Juggernaut Juggernaut (Cain Marko)
villain hero
CBR Scale: I Christian (denomination
Brotherhood of Mutants; Excalibur...  Marvel 387
The Fantastic Four The Fantastic Four
hero group
  [1st app: The Fantastic Four (vol. 1) #1 (Nov. 1961)] Marvel 100
Factor Three Factor Three
villain group
  [1st app: The X-Men (vol. 1) #28 (Jan. 1967)] Marvel 44

Reprints of this comic:
X-Men (vol. 1) #82 (June 1973): "War -- In a World of Darkness!"