I dont really have a problem with cannon characters as long as theyre not too over the top. Some people might feel more comfortable having a cannon name with their character when they first start rping and stuff.

Also some people put lots of great detail into their original characters and some very little so its probably easier for them to base their characters on the personality or ideals of a cannon character.

As long as it doesnt become a big problem it shouldnt really matter, the rp is all about fun =]