Im creating a RPG game in PHP and I have a quick question.

I have a graph pretty much where it has 5 columns 5 rows and right smack in the middle theres the character. Each box is 32 x 32 and I wanted to know how I could get the character to be placed in the middle but be a larger size with out messing up the tile in the middle.

Also there will be monsters that I pull from the DB and when they are placd on the map I would like to know how I could go about making them larger then the tile as well and still be in the correct area