Zera seems like the quintessential edgewalker: could wander either along the path of light or path of darkness, and either way, the power he holds is enormous. But why limit his potential to the Duel Monsters versions of heaven and hell? Observe these.
Elemental Hero Urban Zera
Level 8; Warrior-type; LIGHT; Effect; ATK 2500 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Skyscraper" is on the field. When this card attacks with an ATK that is higher than the DEF of a Defense Position monster, inflict the difference as Battle Damage to your opponent's Life Points. If "Skyscraper" is on your side of the field, this card can attack a number of monsters your opponent controls once each turn for each face-up "Hero" monster you control.
(Note: I know the name isn't that good, but I had nothing else.)
Destiny Hero Zeran Avatar
Level 8; Warrior-type; DARK; Effect; ATK 2500 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Dark City" is on the field. As long as this card remains face-up on the field, control of this card cannot switch. If "Dark City" is on your side of the field, this card cannot be destroyed.
Pharoah Zera IV
Level 8; Zombie-type; LIGHT; Effect; ATK 2800 / DEF 2300
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Temple of the Kings" is on the field. If "Temple of the Kings" is on your side of the field, you may Special Summon monsters from your Graveyard to your opponent's side of the field in place of Tributing. If you Special Summon monster(s) with this effect, your opponent chooses their battle position(s).
Gravekeeper's Warden Zera
Level 8; Spellcaster-type; Dark; Effect; ATK 2800 / DEF 2300
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Necrovalley" is on the field. If "Necrovalley" is on your side of the field, this card can't be destroyed by a monster. When a card is sent to the Graveyard, increase your Life Points by 500.
Cosmic Envoy Zera
Level 8; Warrior-type; LIGHT; Effect; ATK 2800 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Neo Space" is on the field. If "Neo Space" is on your side of the field, you can discard 1 card once per turn, during your Main Phase, to Special Summon 1 "Elemental Hero" or "Neo-Spacian" monster from your hand or Deck. That monster can't attack this turn. If "Neo Space" or "Skyscraper" isn't on your side of the field, this effect is not applied.
Cosmic Horror Zera'Li'Ek
Level 8; Reptile-type; DARK; Effect; ATK 2800 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Otherworld - The 'A' Zone" is on the field. If "Otherworld - The 'A' Zone" is on your side of the field, you may Tribute 1 monster on your opponent's side of the field to Special Summon a monster in your hand to your opponent's side of the field. If "Otherworld - The 'A' Zone" isn't on your side of the field, this effect isn't applied.
Think and chew on THOSE.
Elemental Hero Urban Zera
Level 8; Warrior-type; LIGHT; Effect; ATK 2500 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Skyscraper" is on the field. When this card attacks with an ATK that is higher than the DEF of a Defense Position monster, inflict the difference as Battle Damage to your opponent's Life Points. If "Skyscraper" is on your side of the field, this card can attack a number of monsters your opponent controls once each turn for each face-up "Hero" monster you control.
(Note: I know the name isn't that good, but I had nothing else.)
Destiny Hero Zeran Avatar
Level 8; Warrior-type; DARK; Effect; ATK 2500 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Dark City" is on the field. As long as this card remains face-up on the field, control of this card cannot switch. If "Dark City" is on your side of the field, this card cannot be destroyed.
Pharoah Zera IV
Level 8; Zombie-type; LIGHT; Effect; ATK 2800 / DEF 2300
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Temple of the Kings" is on the field. If "Temple of the Kings" is on your side of the field, you may Special Summon monsters from your Graveyard to your opponent's side of the field in place of Tributing. If you Special Summon monster(s) with this effect, your opponent chooses their battle position(s).
Gravekeeper's Warden Zera
Level 8; Spellcaster-type; Dark; Effect; ATK 2800 / DEF 2300
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Necrovalley" is on the field. If "Necrovalley" is on your side of the field, this card can't be destroyed by a monster. When a card is sent to the Graveyard, increase your Life Points by 500.
Cosmic Envoy Zera
Level 8; Warrior-type; LIGHT; Effect; ATK 2800 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Neo Space" is on the field. If "Neo Space" is on your side of the field, you can discard 1 card once per turn, during your Main Phase, to Special Summon 1 "Elemental Hero" or "Neo-Spacian" monster from your hand or Deck. That monster can't attack this turn. If "Neo Space" or "Skyscraper" isn't on your side of the field, this effect is not applied.
Cosmic Horror Zera'Li'Ek
Level 8; Reptile-type; DARK; Effect; ATK 2800 / DEF 2000
This card cannot be Normal Summoned or Set. This card cannot be Special Summoned without Tributing 1 face-up "Warrior of Zera" on your side of the field while "Otherworld - The 'A' Zone" is on the field. If "Otherworld - The 'A' Zone" is on your side of the field, you may Tribute 1 monster on your opponent's side of the field to Special Summon a monster in your hand to your opponent's side of the field. If "Otherworld - The 'A' Zone" isn't on your side of the field, this effect isn't applied.
Think and chew on THOSE.