It has been decided that due to performance reasons, the Character Reappearances blog will have to be split by year. Even with a tiny bit of characters in just one page, the Wiki editor and blog slows down quite a lot.
For now the data is based off this Wiki information (assuming the data to be true), Google search and watching YouTube videos of past bundle offers. It does not account for any flash deal returns, unless I can find concrete evidence that it is so. Also, past Wordy Weekend appearances (where the character used to cost 
95,000 to unlock) are not counted for the time being.
If I am unable to confirm the character's reappearance (either because there are no such videos on YouTube, or there are fake videos due to game hacks), I will put [citation needed] next to the edition which the Wiki claimed the character would reappear in.
Date is assumed to be on the edition release date, unless I am able to find the exact date the character returned, for which I will mark an asterisk (*).
Characters marked in italics are currently owned by me.
Skye[]
Coming soon...
Thunder[]
Coming soon...
Azura[]
Coming soon...
Dragon[]
Coming soon...
Astra[]
Coming soon...
Stella[]
Coming soon...
Lucky[]
Coming soon...
Meggan[]
Coming soon...
Red Panda[]
Coming soon...
Hamza[]
Coming soon...
Faiza[]
Coming soon...
Teabot[]
Coming soon...
Finn[]
Coming soon...
Electra[]
Coming soon...
Hammy-Bee[]
Coming soon...
Pixel Jake[]
Coming soon...
Ballerina Tricky[]
Coming soon...
Guard King[]
History table will be done when the character reappears in another edition.
Riley[]
Coming soon...
Lily[]
Coming soon...
Rudy Rascal[]
Coming soon...
Ventura[]
Coming soon...
Glorgalax[]
Coming soon...
Hélène[]
History table will be done when the character reappears in another edition.
Leo[]
Coming soon...
Ozzy[]
History table will be done when the character reappears in another edition.
Pins[]
Coming soon...
Audrey[]
History table will be done when the character reappears in another edition.
Billy Bean[]
History table will be done when the character reappears in another edition.
Ruhi[]
History table will be done when the character reappears in another edition.
Kedi[]
Coming soon...
Dr. Flyman[]
History table will be done when the character reappears in another edition.
Pumpkin Pete[]
History table will be done when the character reappears in another edition.
Logan[]
History table will be done when the character reappears in another edition.
Ginger[]
History table will be done when the character reappears in another edition.