Since there's so many series, let's put here pictures that have at least two of them in a single picture.
If the picture show the characters from different series as a couple, put it here instead
- Baby Dragon and Kyubey together here.
- Tewi and Kyubey together. What Could Possibly Go Wrong?
- Tewi and Rescue Rabbit together here.
- While Simon is digging, someone appears.
- Trunks is about to start his decisive time travel, but something interrupts him.
- Espeon and Ruby Carbuncle together here.
- One of these monsters is not a Pokémon here.
- Pikachu and Terriermon here.
- Devastator woke up with the wrong arm here.
- Who could be the mysterious Ditto trainer here?
- Unfinished Digimon/Transfomers poster here◊. Original site here.
- Death Note and Bleach   
- Madoka and Sailor Moon together here.
- Madoka and Biscotti together here.
- Madoka and Nahona together here.
- This is a Magical Girl group shot of Madoka and her gang as well as Sakura, Sally, Akko and Nahona.
- Seto Kaiba, Lelouch Lamperouge, and Light Yagami play a game of Scrabble together .
- Black Butler and Death Note 
- Death Note meets Sailor Moon 
- Pokémon meets Naruto 
- Lucy versus Sakura 
- Naruto as an Arrancar 
- Mobile Suit Gundam 00 cast switch with Light Yagami of Death Note as Setsuna, Firo Prochainezo of Baccano! as Allelujah, Kurz Weber of Full Metal Panic! as Lockon, and Nozomu Itoshiki of Sayonara, Zetsubou-Sensei as Tieria: 
- A MASSIVE anime collage: 
Live Action TV Crossovers
Web Original Crossovers
Multiple Medium Crossovers