"Welcome to the Cathedral of Shadows, where demons gather..."
- Megami Tensei II
- Kyuyaku Megami Tensei
- Majin Tensei
- Shin Megami Tensei
- Shin Megami Tensei II
- Shin Megami Tensei III: Nocturne
- Shin Megami Tensei IMAGINE
- Shin Megami Tensei IV
- Shin Megami Tensei IV Apocalypse
Mido is encountered by the protagonist shortly after the first scenario, where he teaches him the art of fusing demons. He tells the protagonist the latter is the only one capable of saving this chaotic world. The player gains the ability to perform mid-battle fusions after.
The Cathedral of Shadows is located at various points on the world map and is described by NPCs as having mysteriously appeared out of nowhere.
Shin Megami Tensei III
The Minister first meets the Demi-fiend at the Cathedral of Shadows in Shibuya. Well aware of the Demi-fiend's destiny, he offers the cathedral's services for him and tasks him collecting all 24 Magatama. If the Demi-fiend does so, the Minister will give him the Lord's Sword, capable of opening the way to Masakados.
Shin Megami Tensei IV
Mido is a digital AI downloaded onto a Samurai's Gauntlet once they buy the Fusion App that is available once it is brought up by Burroughs. He is a digital entity based on the head of his original body, with a blocky and glitchy appearance. He runs his own digital version of the Cathedral of Shadows and explains the details about fusion and summoning to the summoner. Whenever a new special fusion is possible he informs Flynn when he next uses the app.
As the game progresses new dialogue with him will appear in the talk section of the Cathedral of Shadows app, where he mentions he looks forward to working with the five new Samurai. Mido tells that he has spent his life crafting the app for use and boasts that it is the ultimate demon app. When asking "Who are you?" he will reveal that he was originally a man fascinated with demons and became a digital entity.
Talking to him at some point in Blasted Tokyo will have him mention that the server he works from can reach all sorts of places so Flynn should have no worries about not being able to connect even when in alternate worlds. Chatting with him after alignment lock has him reveal that he can go through the gauntlets data and decides to give a Challenge Quest after seeing everything Flynn has done so far. In order to have his research furthered, he gives the quest Chance meeting with a Saint to Burroughs, revealing his desire to speak with Enoch, the man who fused with an angel.
Shin Megami Tensei IV Apocalypse
Mido returns as the master of the Cathedral of Shadows App. This time he gives voiced instructions for each segment as Nanashi uses or goes into different parts of the app the first time, noting that Nanashi does not use the Demon Summoning Program the rest use to connect to the server. Once the Divine Powers take Flynn captive he can reveal his excitement at more opportunities to fuse new demons.
Once the Tokugawa Mandala is activated, Mido is freaked out by how no one can access the app, asking Nanashi to use him as much as possible in everyone's stead so the app doesn't go out of business. During Armageddon he urges him to optimize his demons for the upcoming battle. He laughs with joy at seeing Nanashi choosing Dagda's route, happy to see a fellow who also abandoned humanity use the app and wishing for him to use it even more now that he's gone down this path.
- Along with Stephen and Saint Germain, Mido has transcended the cycle of Transmigration and become a being similar to a Buddha.
|Playable||Akemi Nakajima - Yumiko Shirasagi - Cerberus|
|Non-playable||Minotaur - Medusa - Rick - Loki - Gaia - Hecate - Izanami - Seth - Lucifer|
|Daimakyuu||Micon - Tower of Daedalus - Bien - Valhalla Corridor - Mazurka Corridor - Rotting Sea of Flames - Infini Palace - Hades|
|Terminology||Demon - Hinokagutsuchi - Magnetite - Moon Phase System - Cathedral of Shadows (Fusion) - Rag's Jewelry - Izanami Clothes|
|Lists||Demons - Items - Spells (Kyūyaku)|
|Games||Megami Tensei (Telenet) - Kyūyaku Megami Tensei|
|Playable Characters||Protagonist - Heroine - Law Hero - Chaos Hero - Pascal|
|Non-Playable Characters||Stephen - Ozawa - Yuriko - Old Man - Gotou - Ambassador Thorman - En no Ozuno - Louis Cyphre - Soul Diver|
|Locations||Tokyo - Kichijoji - Shinjuku - Ichigaya - Diamond Realm - Shibuya - Roppongi - Ginza Underpass - Ginza - Tokyo Tower - Shinagawa - Ikebukuro - Ueno - Tokyo Destinyland - Basilica - River Styx|
|Terminology||Terminal - Alignment - Ring of Gaea - Order of Messiah - Great Cataclysm - Sword fusion - Four Heavenly Kings|
|Soundtracks||Shin Megami Tensei Sound Collection|
|Archives||Demons - Bosses - Skills - Items|
|Playable Characters||Aleph/Hawk - Hiroko - Beth - Cerberus - Lucifer - Satan|
|Non-Playable Characters||Okamoto - Gimmel - Zayin - Stephen - Haneda - Daleth - Red Bear - Madam - Hanada - The Center's Bishop - The Four Elders - Mekata - Puck - Hanoun - Mutant Elder - Hiruko - Taira no Masakado - Siren - Petersen - Michael - Raphael - Uriel - Gabriel - Fake YHVH - Seth - Virocana - Ozawa - Gotou - Gemori - Astaroth (Ishtar / Ashtar) - Kuzuryu - YHVH|
|Locations||Tokyo Millennium - Underworld - Expanse - Eden - Diamond Realm - River Styx|
|Terminology||Millennium Kingdom - Great Cataclysm - Order of Messiah - Ring of Gaea - Terminal - Sword fusion - Identification Program - Summon Doll - Seven Pillars of Solomon - Sabbath - Abaddon's Innards - Megiddo Arc|
|Content||Demons - Bosses - Skills - Items|
|Characters||Protagonist - Azura - DB Mikanagi - DB Kano - DB Kuroe - DB Yamaguchi - Kuzaka The Wise - Lord Judah - Madam Justice - Lord Doukan - Ogami - Setsu - Snakeman - Yamamoto the Steel-Willed - Louis Cyphre|
|Locations||Arcadia - Cathedral of Shadows - Ichigaya - Ikebukuro - Nakano - Protopia - Second Home - Shibuya - Shinagawa - Shinjuku - Shinjuku Babel - Souhonzan - Suginami - Third Home - Ueno|
|Dungeons||Suginami Tunnels - Basilica|
|Music||"Amatsuchi" - "Haru Megido"|
|Terminology||Cult of Gaia - Demon Buster - Great Cataclysm - Innocent - Millennium Kingdom - Obelisk - Order of Messiah - Seven Philosophers - Yagi - Chain of Curse|
|Archives||Demons - Skills (Features)|