Some of the character pages are messed up. Each should look like this:
At the top, write a brief description of the character. This includes their weight class(es). Add a picture of that character at reasonable size.
Here, put how they look in detail (see Rosalina) and any special traits they have.
Appearances in the Mario Kart series
Here, put (in a bullet list and with links) the games that character appears in.
Put the karts that character can use.
How to Unlock
If the character is unlockable in one or more games, then put a sub-heading for each game and under that, put how to unlock them.
If there are more than one pictures of the character, put them in a gallery here.
Put any special information that doesn't fit into any other section here. Make sure this is relevant to the topic.