these are genderbends of characters from a manga series made in 1992 the main character is called "Nikki", he's a nerdy kid and kind of a wuss, but when he wishes to get stronger, he transforms into Sonic and saves the day, kinda like the "megaman zero" manga
it's a very cute manga series but very childish and repetitive, I'm sure I would have loved it if I red it as a child:) (Smile)
if you want a sonic manga for all ages look for "sonic manga dash and spin:super fast sonic" it's the best XD Image size