Representing 'Z' and the 1st update, it's absolutely *jammed* with crazy (maybe... interesting?) characters here. Really, I recommend starting with volumes 13, 11, 5, and 1.
The contents here include: Zar; Zara; Zarathos; Zarek; Zarrko the Tomorrow Man; Professor Zaxton; Zeitgeist (Ekler); Zemu; Zeus; Zhered-Na; Abraham Zimmer; Z'nox; Zodiac (teams); Zodiac Key; Zodiak; Philo Zog; Arnim Zola; Zom; Zombie; Zombie Master; Zota of Pergamum; Zxaxz; Zzzax... and then: Aboriginal Gods; Achelous; Ahau (Mayan gods); Ajak the Eternal; Akua (Oceanic gods); Anansi; Anelle; Ant-Man's ants; Anti-Registration Underground; Anti-Venom; Ape (Karlbad's); Apollo (Phoebus Apollo); Apu (Incan gods); Aragorn (Valkyrie/ Brunnhilde's steed); Bambi Arbogast; Aria; Asgardians; Athena; Azrael/Lazaer; Balder; Breeze Barton; Baymax; Dexter Bennett; Blue Blaze; Blue Shield; Bookie; Bor; Isaiah Bradley; Bran the Blessed; Brass (Watanabe); Edward Brecker; Brightwind; Bethany Cabe; Caber; Vera Cantor; Captain Marvel (Khn'hr); Whirlwind Carter; Cerberus (Hades hound); Charlemagne (mercenary); Chimera (extradimensional merc); Chronomancer; Cloak imposter (Mantz); Cockroaches; Collector's zoo; Avery Conner; Carlie Cooper; Cosmo (dog); Nguyen Ngoc Coy; Cr'reee; Cronus; Cuchulain; Currs; Daevas (Hindu gods); Dagda; Dakor; Dale of the FBI; Deadline Dawson; Y Ddraig Goch; Betty Dean; Dave Dean; Devil Dinosaur (Earth-78411); Deuce; Diablo (bear); Diablo (Esteban Diablo); Diablo (smoke monster); Dievas (Slavic gods); Dionysus (Olympian); Dirt Nap; Diwatas (Filipino gods); Dogma; Doombringer (extradimensional); Dragon-Men of Ligra; Dreamstalker; Dynaman; Dynamic Man; Ebon Samurai; Ebony (cat); Electro (Zog's robot); Ennead (Heliopolitans/ Egyptian gods); Jimmy Everett; Falcon (Burgess); Fen; Ferret; Fiery Mask; Flexo; Flying Flame; Fomor; Flash Foster; Freak (drud addict); Freki & Geri; Frogs of Central Park; Garm; Gibborim; Giganto (aquatic); Gogo Tomago; Vin Gonzales; Don Gorman; Gravemoss; Green Knight; Groot; Growing Man; Mark Gruenwald; Gwynn; Lynne Harris; Heimdall; Hela; Hellhorse; Hellstorm's horses; Hephaestus; Hera; Hercules (David); Hermes; Hijacker; Hippolyta; Cameron Hodge; Honey Lemon; Horde (mutant); Phineas T. Horton; Horus; Hugin & Munin; Human Top (Bruce Bravelle); Hungry; Inanna; Ina & Biri; Invisible Man (Gade); It the Living Colossus; Izanagi; Jackpot (Alana Jobson); Zephyr Jones; Jumala (Finnish gods); Justice Peace; Kimora; Kirby (Kerberos); Amiko Kobayashi; Kraven the Hunter's menagerie; Ana Kravinoff; Kril; Lady of the Lake (Niamh); Landau, Luckman & Lake; Steven Lang; Laughing Mask; Leapfrog (vehicle); Leir; Saint Cyrus Leviticus; Tigon Liger; Lion-people; Lobo (wolves); Lockjaw; Loners; Lord Dark Wind; Lord Shingen; Luna; Magar; Majesdanians; Mana; Mandate (Earth-3071); Man-oo; Manidoog (Native American gods); Manitou (Gitche Manitou); Mannites; Mantor; Marionette; Marvel Boy (Bank); Marvex; Masked Raider (Gardley); Masque (Whitney Frost bio-duplicate); Master Mind Excello (Everett); Master Pandemonium; Mastermind (Jason Wyngarde); Ken Masters; Max (Punisher/ Castle's dog); Leonard McKenzie; Menace (Mutant imposters); Menace (Hollister); Merzah; Mister E (Jay); Mister Negative; Misty; Mole Man's Monsters; Monako; Monkey Joe; Monstro the Mighty; Barney Mullen; Muro; Netherlands; Niels; Nimo; Nuada; Oberon (Otherworld); Omnivore; Osiris; Otherworld; Outcasts (New Mexico); Owayodata; Phantom Bullet; Phantom of the Underworld; Phantom Reporter; Phobos (Aaron); Comet Pierce; Poseidon; Klara Prast; Princess Python; Psi-Lord; Joey Pulaski; Punisher (2099 AD; Jake Gallows); Quetzalcoatl; Rama-Tut (Richards); Red Lord; Rising Sons; Luther Robinson; Shango; Siege (Kelly); Sky Devils; Space Rangers; John Steele; Captain Bob Strong; Talisman (Australian); Tarantula (Vasquez); Tuk the Caveboy; Wally the Wizard; and then Yandroth.