The current event unit's name is Sarasa and she is a Bow Rider.

This was an event from last year:
http://www.himeuta.net/f18-gaming-di...tml#post403971
The following event:
http://www.himeuta.net/f18-gaming-di...tml#post409530

Quick link to the current event info:
http://www.himeuta.net/f18-gaming-di...tml#post287050

Here are some threads to follow if you are playing the DMM version:
http://www.himeuta.net/f18-gaming-di...-war-2181.html
http://www.ulmf.org/bbs/showthread.php?t=24452

As usual, clicking the image on Petite Soeur's signature will lead to the latest event information.