A few people have pointed out seeing open slots in the smiley tab for Anime. If you mouse-over each space you’ll get the following:
(haira7)(haira8)(haira9)(haira10)
Here’s what it looks like:
I haven’t noticed it before so I’m just assuming that it’s something new. 
We’ve added two more Xat powers nick generators to our website. Our intent is to place everything on one page and have that page dedicated to powers nick creation.
We already have the Nameglow generator, and now we’ve added two more; a Beam and Anime nick generator.
Give each of them a look. They’re meant to take the hassle and guesswork out of creating colored nicks using the most common Xat powers.
Xat has revived and announced its soon to be released Anime power. This power which first popped up back in may then mysteriously disappeared, will include smilies, tops, hairstyles, and many accessories; 22 in all!
Unconfirmed Anime codes:
(awe)(ahhh)(comeon)(dizzy)(doh)(grin)(grump)(haira1)(haira3)(haira4)(haira5)(headband)(maniac)(pouty)(quiver)(rage)(squint)
Update 1: This power is now on sale for 300 xats and is unlimited
Update 2: More details have been posted to the Xat Anime Wiki