"to types of roleplay characters", does this mean characters I'm being in a roleplay or that my partner is being?
Lots of people use it to mean either characters you portray or they portray. It lets you indicate types of characters you really like or want to play and characters you don't want to play with, so if you don't want to roleplay with furry/anthro characters, you can indicate that by not listing those options or putting them in the "I will not roleplay with these types of characters" list. Conversely, if there was a kind of furry you really liked, like Neko (Cat) you could put that in your chaaracters you will roleplay with.
Hope that makes things clearer, the preferences sheet can be a little confusing sometimes.