Ramuh

Ramuh is a character and summoned monster in the video game series Final Fantasy. He is related to thunder and lightning, and is represented as an old man carrying a gnarled wooden staff. His attack is called Judgement Bolt (or Bolt Fist in Final Fantasy VI). Assumed to be named after the Hindu God Rama. In Final Fantasy VIII he is replaced by the Guardian Force Quezacotl; in Final Fantasy X he is replaced by the Aeon Ixion

Final Fantasy IV
Rydia is the only character who can summon Ramuh, and he is obtained automatically when the party fights Golbez in the Dwarves' Castle. He was translated as Indra in the Super NES release.

Final Fantasy V
Ramuh is a Level 2 Summon lives in the forest outside of Istory Villiage. The party must fight him as a random encounter and defeat him. If the party has obtained Ifrit, there will be some extra dialogue.

Final Fantasy VI
Ramuh, as an Esper plays a major role in Final Fantasy VI, as the guardian of Terra while she is coming to her senses, and he is the one who sends the party to Vector in order to rescue his friends, as well as Terra's father Maudin. He then turns himself into magicite, and costs 25 MP to summon. His Spell Power is 50, and he is unblockable. He teaches the following spells:
 * Bolt X10
 * Bolt 2 X2
 * Poison X5
 * At Level Up: Stamina +1

Mog also mentions that Ramuh told him to fight alongside the party.

Final Fantasy VII
Ramuh is a Summon Materia that is obtained in the Gold Saucer. The player must pick up this materia in the Chocobo Jockey Room after Barret Wallace defeats Dyne. If Cloud Strife does not pick it up then, it becomes unobtainable.

Level -- AP Needed Stat Change
 * Level 1    --  0
 * Level 2  --    10000
 * Level 3    --  25000
 * Level 4   --   50000
 * Level 5    --  70000
 * Magic +1
 * Maximum HP -2%
 * Maximum MP +2%

Final Fantasy IX
Ramuh is an Eidolon, and once again plays a major role in the story. After Zidane Tribal, Vivi Orunita, and Princess Garnet flee Alexandria, they wind up in the Pinnacle Rocks. Ramuh reveals himself to Garnet, and she asks him for his help. Ramuh was worried about what Odin did in Cleyra, but Garnet said that it was Queen Brahne's fault. Ramuh agrees to help Garnet if she can pass his test of completing a story. If she succeeds, Ramuh gives her a Peridot, which can be used to summon him in battle.

Final Fantasy Tactics
Ramuh performs a lightning attack when summoned.

Etymology
Ramuh is said to have been loosely based on an epic Hindu poem, written by Valmiki, called, Ramayana. The protagonist of the story is called Raama (also spelled Rama), who was said to have been the incarnation of the Hindu god, Vishnu. It could be suspected that the name Ramuh is an Amalgam of Raama and Vishnu, though this is not confirmed.