ERAMEGATEN: EVERYTHING TO KNOW ABOUT FUSION:
-All Demons x Demons of the same Race will give you an Element-Race Demon.
-Fusing an Element-Race Demon with another Demon will "Rank-up" the non-Element Demon (Except with a Zoma + Kaleido Softaware, wich results in Hisui).
-Elements can't fuse with each other.
-To get a Zoma, one must fuse a Demon with a Dolly Kadmon (Puchaseable at the Macca Exchange for 500 Macca).
-Hero-Race demons (the result of Zoma x Demon) cannor fuse with anything except themselves
-Rumor-Race demons and Hero-Race demons appear in the compedium but cannot be Summoned from it. You'll have to get the demons manually.
-WARNING: I don't know if this is a glitch or intentional (90% sure it's a glitch) but some Touhou demons will NOT appear in the compedium despite being able to be registered (This has happened to me with Sekibanki and Wakasagihime). This means that if need to be careful with wich 2hu you fuse, as you'll have to re-fuse some of them.
-Another 2hu thing (I don't think this mod mixes well with the Fusion System): When fusing an Element-Race Demon with a 2hu, the rank-up will result in a NORMAL SMT Demon of the same race, not another 2hu.
-Some Demons have Races that don't appear here, This means that those Races are actually renamed. The list of renames is this:
+Holy, Avatar, Wilder and Vermin (for some reason) are actually Beast
+Night and Genma are Yoma
+Undead, Haunt, Jaki, Spirit and Ghost are ALL Foul (Why does Foul have so much shit)
+Reaper is Tyrant
+Femme is Brute (Even if it sounds like a Lady-Race rename); Tsukumo (Unique Race of the Tsukumogami sisters from 2hu 14) is also it
+Mermaid (Wakasagihime-exclusive I think) is Megami
+Drake and Dragon are Snake
+Funnily enough, Divine and Beast are considered DIFFERENT Races by the compedium, even if Fallen-Race Demons can only be obtained with the Goetia Software (Fallen in general gets really fucked, they don't even have a Meguca/MB character to represent them)
+Vile and Deity are male versions of Lady and Megami (not that sure about this one, I'll have to check it Later)

-NORMAL FUSION TABLE:
Fairy:
x Foul: Beast
x Flight: Divine/Fallen
x Lady: Yoma
x Yoma: Brute
x Beast: Megami
x Brute: Holy
x Rumor: Brute
x Snake: Brute
x Megami: Brute
x Divine: Megami
x Fallen: Megami
x Tyrant: Snake
x Zoma (Incubator Sotware): Magica Yuma
Flight:
x Foul: Yoma
x Lady: Beast
x Yoma: Rumor/Foul (seems based on level/"additional Name" [Ex: Result of Hatate + Reisen is called "Spirit" but is considered a Foul])
x Beast: Snake
x Brute: Yoma
x Rumor: Rumor
x Snake: Beast
x Megami: Fairy
x Divine: Megami
x Fallen: Megami
x Tyrant: Divine/Fallen
x Zoma: None
Foul:
x Lady: Tyrant
x Yoma: Fairy
x Beast: Snake
x Brute: Flight
x Rumor: Lady
x Snake: Megami
x Divine: Brute
x Fallen: Brute
x Tyrant: Lady
x Zoma (Kaleidoscope Software): (Maid?) Kohaku
Lady:
x Yoma: Tyrant
x Beast: Yoma
x Brute: Foul
x Rumor: Megami
x Snake: Holy/Beast (Level-reliant?)
x Megami: Divine/Fallen
x Divine: Megami
x Fallen: Megami
x Tyrant: Foul
x Zoma (Incubator Software): Magica Homura
Yoma:
x Beast: Flight
x Brute: Fairy
x Rumor: Fairy
x Snake: Tyrant
x Megami: Divine/Fallen
x Divine: Lady
x Fallen: Lady
x Tyrant: Brute
x Zoma (Both Software): Magica Mami/Alchemist Sion
Beast:
x Brute: Tyrant
x Rumor: Flight
x Snake: Flight
x Megami: Fairy
x Divine: Flight
x Fallen: Flight
x Tyrant: Yoma
x Zoma (Incubator Software): Magica Kirika
Brute:
x Rumor: Snake
x Snake: Foul
x Megami: Snake
x Divine: Foul
x Fallen: Foul
x Tyrant: Fairy
x Zoma (Incubator Software): Magica Kyoko
Rumor:
x Snake: Beast
x Megami: Tyrant
x Divine: Yoma
x Fallen: Yoma
x Tyrant: D/F
x Zoma (Kaleido Software): Satsuki
Snake:
x Megami: Flight
x Divine: Yoma
x Fallen: Yoma
x Tyrant: Beast
x Zoma (Kyubey Software): Sayaka
Megami:
x Divine: Lady
x Fallen: Lady
x Tyrant: Lady
x Zoma (Kyubey Software): Madoka
Divine/Fallen:
x Tyrant: Snake
x Zoma (Kaleido Software): Ciel (But only Divine. Fallen sadly gets nothing)
Tyrant:
x Zoma (Kyubey Software): Oriko
-UNIQUE FUSIONS:
-Any 2hu from the Sixth (first in Windows) game x Zoma: Sakuya
-Any Magician + Nitori x Zoma: Marisa
-Any Buddhist x Zoma: Byakuren (This girl was kind of a headache to get. First of all Kyoko does NOT work despite being part of the buddhists, but Mamizou and Kogasa DO work. Second, despite her race being Meta and Meta being a race registered in the compedium, she's actually HERO-RACE. Also she's level 45 unlike the rest of the Zomahus wich are between 20-30)
-Any Taoist x Zoma: Miko (I'm actually guessing this one, I haven't gotten any Taoist yet. If somebody gets the fusion tell me [or edit the Pastebin])