Perhaps most of you clicked on this to read and then criticise me for such a 'stupid idea' to that I say, I don't care, just don't ruin it for the people who actually clicked on this to read this explanation. The people who did click on this to read the explanation are either Undertale fans or Sonic fans, and when you saw this title you were just overflowed with happiness or curiosity. Now what this is basically is Undertale with Sonic characters instead, as much of you have already guessed, here are the character replacements for this particular Fanfiction.
Toriel= Cosmo
Most of you older kids may remember a god-awful 4Kids adaptation of Japan's SonicX, the word makes me cringe every time I write it or say it. It did have one pertaining quality to me though, and that was a character for the third season and that was Cosmo. I won't go into more details so to make it short and sweet, Cosmo replaces Toriel because she is very thoughtful of others, tends to be a pacifist for most of the time, and she loves her close friends and treats them like family but she is not the wife of the king only his caretaker.
Undyne= Blaze
Both protect their people with the utmost concern, they both are badasses, and every other female character can't seem to handle themselves quite like Blaze and Undyne. Blaze is filled with a fiery passion to see her people free and to see the surface to see the legendary human weapons, she does have a soft side and will grow on the reader.
Alphys= Silver
Silver will not be as such a shut in like Alphys, but still have the social awkwardness. Silver does keep his telekinetic powers and his intellect, but he does not have knowledge of other timelines, he's just as clueless as the rest of them. He loves, Blaze, his inventions, and his favorite cartoons.
Asgore= Shadow
Before you say Shadow is not the soft type and reluctant to fight type, let me explain. Shadow is Asgore because he does have a soft side, not so much all the time, but he does. When you fight Shadow he reluctantly does so because of your pacifist actions, he is still the same old Shadow and will mock you and be... well Shadow. Shadow does not like humans because they took his wife, and son away from him, if you kill anyone underground he'll say your 'just like a human' Shadow wants to free his people and will try to get your SOUL to free them. Depending on the actions (or in this case the story) of the reader it will change how he reacts to you just like in UnderTale.
Papyrus= Cream and Cheese
Now hold on before you grab the pitchforks and torches let me explain! Cream has a child like innocence and tends to think that there is good in people if they try, she also tries to do her best to please others like her good friend and teacher Blaze. Another fact that i've known is that she likes to cook sweets and does a good job actually! Cream is deftly afraid of humans and will do anything to stay away from them by setting up puzzles and traps hoping that the humans will just give up and go away. She is forced to join the patrol with her brother Tails to get over her fear of humans, and also because Blaze forced her.... The reader can get along with Cream rather easily and become her friend, making her get over her fears. "With you as my friend, how can humans be that scary?" Cream is not so energetic as Papyrus, but she tries just as hard, she likes her brothers humor, but it tends to annoy her after a time. With her faithful Chao,Cheese by her side she proves to be just as lovable!
Temmie= Chao
Do I really need to explain this one?
Flowey= Omochao
"Hi i'm Omochao and i'm here to take your SOUL!"
This little mechanical helper has always made me nervous with his never ending smile and his tips about everything, its like he know all and sees all! Omochao is one of those characters that you either love or hate, and with Flowey its the same you first love him but after a time you hate him with every fiber of your being.... Omochao will follow you around and tempt you to change you alignment and try to destroy you by turning into OmegacChao. (See what I did there?)
Sans= Tails
Tails has always been underestimated and generally a lot of people like him as a side character and people like to see what would happen if Tails was a bit stronger, my self included. Think about it, if you've never played Undertale and was introduced to this first instead of the actual game you would think Tails was a cool character. With his jokes, one liners, and maybe the fight you might do against him when your not on a Genocide Route you wouldn't think that Tails was a big threat. Tails tries to be there for you and he secretly watches you as you progress, watching you to judge you at the end. If you do decide to do a Genocide Route Tails wont stop you until your third one, there are three save slots in this AU of Undertale, when you try to erase the world he stops you by instantly killing you and then Bad Times are ahead for you. I won't spoil Tails's past and how he became the person he is in this AU, that will be a different story entirely.
W.D Gaster= Amadeus Prower
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The only one I don't have a character is Mettaton, which I thought at first would be CC an OC made by a tumblr known as E-vay (Go check her out!) but I an still thinking about others CC is a last minute choice so if you guys have some suggestions please write to me! Frisk/Chara are unchanged as well, on of the Tails back stories will tell why it is unchanged. Other thant that I have just about covered everything about this Fanfiction feel free to send me ideas and to ask me questions about the Fanfiction! I will post as soon as I can, hope you guys will enjoy reading this as much as I am making it!
-Qewey01