User blog comment:LoverOfStripes87/Collab Units Question/@comment-29915332-20161115054541

The units are 'dressed' as main game units, like in 'divine gate'. For Example: In the Fate/Stay night collab, there is a unit of Saber ( http://divine-gate.wikia.com/wiki/File:1058.png)  resembling Arthur ( http://divine-gate.wikia.com/wiki/File:296.png).