Yes it is Hatsune Miku , she is one the best anime virtual singer as well she was popular around the world created by Crypton Future Media and thanks to SEGA for create her own rhythm game : Project DIVA series .
 
Synopsis :  
Hatsune Miku is ready to live concert in Canterlot City , State of Equestria after she was live concert in Los Angeles . Then Hatsune Miku was received an new message about the Canterlot City that Eggman want to destroy it and it was repelled by The fastest Japanese teenager with his blue spiky hair (Sonic) and then Miku heard sounds familiar about this guy compare to Sonic the Hedgehog and then she recognized it was Sonic , he was the human since Sonic don’t want to be the hedgehog after he quitted from SEGA . Then Miku find his address to seeking him and then Sonic was in the Canterlot High School where Sonic is studying at this school in 4 months ago . Then Miku has found Sonic on the hallway when she ran at him and hugging him tie . Plus all of students has shocked up (Including Rainbow Dash , she doesn’t want any girlfriend who attempt to take Sonic away) to see Hatsune Miku meet Sonic again . This is the not the first time since the both was met in his Birthday 20th in 2011 for SEGA’s mascot : Sonic The Hedgehog ………
 

 
 
Sonic the Hedgehog series belong to SEGA and Sonic Team  
Hatsune Miku belong to SEGA and Crypton Future Media  
My Little Pony : Equestria Girls series belong to Hasbro