SeiferTim

Enter your Character’s name and realm and a WoWTag displaying your avatar, name, race, class, guild, level and title will be placed on your site. 
You can customize how it is displayed.

WoWTag Widget

Enter your Character's name and realm and a WoWTag displaying your avatar, name, race, class, guild, level and title will be placed on your site.

edik

Some WordPress functions outputs character entity references. The most of these are not allowed in XHTML. So if your WordPress installation uses the mime type ‘application/xhtml+xml’, the generated sites could have invalid xhtml code and the browser would display the syntax error page.
Convertentity converts all entity references into their corresponding characters with the exception of the references for the following characters: ‘<>&”
Theses references are the only ones which are allowed in XHTML.

Convertentity

Converts all character entity references, which are forbidden in XHTML, into their corresponding characters.

WoWTag Widget vs Convertentity