An: This is the known universes.
1: Justice League (Arrowverse and various others added to it)
2: Avengers (Mostly mixed series)
3: Mortal Kombat
4: Transformers
5: Ben 10
6: Naruto
7: Bleach
8: Fairy Tail
9: Sekirei
10: Avatar the Last Airbender/Legend of Korra
11: Call of Duty
12: Totally spies
13: High School DXD
14: Star Wars
15: TMNT 1987/2003/2013
16: Street Fighters
17: Queen's Blade
18: Rosario Vampire
19: Monster Musume
20: Fast and Furious
21: Gears of War
22: Halo
23: Ghost in the Shell Stand Alone Complex
24: Godzilla (Monsterverse and other series)
25: GI JOE
26: Hellboy
27: Power Rangers (every season)
28: Pacific Rim
29: Maken-Ki
30: How to train your dragon
31: Danny Phantom
32: Jackie Chan Adventures
33: Army Men
34: Kim Possible
35: Akame Ga Kill
36: God of War
37: Saints Row
38: Generator Rex
39: Megas XLR
40: Xiaolin Showdown
41: He Man and the Masters of the Universe 2002
42: Jurassic Park
43: One Piece
44: All Grown up
45: Code Lyoko
46: Yugioh (everything)
47: Pokemon
48: Elder Scrolls
49: CSI
50: The Black List
51: Criminal Minds
52: NCIS
53: Chicago PD
54: Food Wars
55: High School of the Dead
56: My Hero academia
57: Dead rising
58: Ikkitousen
59: Trinity seven
60: Seven Mortal Sins
61: That time I got reincarnated as a slime
62: Fairy Odd Parents.
63: Rwby.
64: Winx club.
65: Maleficent.
66: Descendants.
67: Cruella.
68: Once upon a time.
69: Dungeons and Dragons.
70: Mass Effect.
71: Star vs the Forces of Evil.
72: My little pony.
73: Power puff girls Z.
74: Duck Dodgers.
75: Undertale
76: Resident Evil
77: Thunder Cats
78: miraculous lady bug and cat noir
79: Kingdom hearts
80: Samurai Jack
An: this a continuous chapter so if you have any shows that isn't adult swim then tell me.
81: Hazbin Hotel.
82: Helluva Boss.
83: Helltaker.
84: Fnaf
85: Bendy and the ink machine
86: The Adventures of Jimmy Neutron, Boy Genius.
87: Dexter's Laboratory
88: Harry Potter
89: Wander over yonder
90: Lego
91: Sonic the Hedgehog
92: Ducktales 2017
93: Mario Bros
94: Black Clover
95: Metroid
96: Mysticons
97: Huntik: Secrets Seekers
98: Slugterra
99: Lolirock
100: Max Steel
An: only 50 crossovers can be added
101: Fire Force
102: Amphibia
103: Owl House
104: American Dragon
105: Mega Man
106: Senran Kagura
107: Spawn
108: Asura's Wrath
109: Heaven's Lost Property
110: Tales of the Foundation (most dangerous scp won't be added)
111: Chaotic
112: Sofia the First
113: Elena of Avalor
114: the secret saturdays
115: Fallout
116: the Boys
117: Dragon Age
118: men in black
119: Invincible
120: Invader Zim
121: My life as a Teenage Robot
122: 6teen
123: Total Drama
124: Redakai
125: Monsuno
126: Devil may cry
127: Doom
128: Hot Wheels Battle Force.
129: Charmed
130: Class of the Titans
131: Blue Exorcist
132: Testament of a sister new devil
133: Regal Academy
134: Sweet Tooth
135: Sabrina
136: Supernatural Academy
137: Rush Zone Season of the guardians
138: Randy Cunningham 9th grade ninja
139: Jupiter Lee
140: Loud House
141: Blazing Team
142: She Ra
143: The Deep
144: Kipo and the Age of Wonder beasts
145: Shimmer and Shine
146: Witch
147: Motorcity
148: Arcane
149: Overwatch
150: