Amy Rose is a bold and nice pink hedgehog. This figure is specifically Classic Amy, made by Jakks Pacific. She is very nice and cute.
Espio the Chameleon is my favorite character, a serious ninja detective purple chameleon. I have 2, both from Jakks Pacific. The smaller one is one of the minifigures sold in small boxes, and was given to me by my beloved partner Saturn. The larger one is one I bought myself (I could not believe my eyes when I saw him in Walmart!) and he has 12 points of articulation.
Doctor "Ivo" Robotnik (AKA Eggman) is the main villain of the series. He is a human man with a notable bushy mustache. This figure I have is specifically classic Eggman, made by Jakks Pacific. He is very silly.
Jet the Hawk is a cocky asshole rival racer to Sonic. He is also a green hawk. This is a large RC racing Jet, with a moving extreme gear board that actually works. My lovely partner Saturn bought him for me for Christmas one year.
Knuckles the Echidna has red fur and is the tough fighting type. I have many figures of him:
1) Jakks Pacific figure. This is specifically of classic Knuckles, he is rather nice quality.
2) PEZ candy holder. This was originally a gift from my partner Saturn.
3) Mystery blind bag keychain. Made out of a slightly rubbery material, cute.
4 and 5) These are Mcdonald's figures meant to promote the Sonic 2 movie. They are specifically live action Knuckles. Both of them have wheels on the bottom so they are able to run/slide fast.
6) Burger King toy. This is from 1993, so it is the classic era and vintage. It has wheels on the bottom of the cloud that makes Knuckles spin.
Metal Sonic is the robot clone of Sonic the hedgehog. This one is specifically a mystery blind bag keychain, who I was given by a pony friend of mine Doodlepoodle during a pony gift exchange :)
Mighty the Armadillo is another tough fighter type but he is more of a pacifist than Knuckles is. He has black fur and a red shell. This one is a Jakks Pacific figure, and he's very nice quality.
Miles "Tails" Prower is a fox with yellow fur and two tails. He is a very smart inventor type character. I have many figures of him:
1 and 2) These are Mcdonald's figures meant to promote the Sonic 2 movie. They are specifically live action Tails. One of them is missing hte base he is meant to sand on, but the other has wheels on the bottom of his base so that he can fly fast.
3) Jakks Pacific figure. This one is specifically classic tails, he is very cute.
4) PEZ Candy holder. This is specifically classic Tails.
Shadow the hedgehog is Sonic's edgy brooding rival. He has black and red fur. This is a juice lid featuring Shadow, I believe my partner Saturn gave it to me.
Silver the Hedgehog is a white hedgehog from the future who has telekinesis powers. This is a mini figure from 5 below that includes Silver inside of his car from Team Sonic Racing. The wheels actually spin, so he can race around.