Should be asked in the Players Section of the forum not here.....
But that being said I really like the twins from Racing, Borja san Emeterio a RB who I always sign and his midfield twin Fede. Such a special combination so always sign the 2 because twins is such a rare occurrence. Lads like Oliver from A. Madrid or Segri Sampar from Barce would also fall under the Wonderkid umbrella.