Is there a difference in Males or Females?
Gender does NOT effect the personality of a hedgehog. Each hedgehog does have its own personality, some are shy, other curious, other on go, etc. The biggest difference if there is one.. is 'boy time" with the males is more noticeable then "girl time" with a female hedgehog. Both genders do this, because of how they ball up, their privates are right by their faces. Boys do it more often and tend to have more evidence of this behavior.
What do they eat?
I feed our hedgehogs a combination of cat food and insects. More can be found on care page about this topic.
How big do they get?
Hedgehogs actually vary a lot in size. Some can weigh 350 grams fully grown and fit in your hand, while others may get to be 800 grams. They are very active and require a lot of floor space.
They are larger than hamster and require a cage the size suitable for a guinea pig or rabbit. A solid bottom cage and not wire. More can be found on my care page.