Bead Head Hares Ear fly is based off a classic fly pattern and is highly effective for catching all types of fish.  The bead adds additional weight to get the fly lower into the water column where fish are feeding and the soft hackle gives it additional movement.  Although not a traditional Tenkara fly, it works great when at the end of a Tenkara rod.  Also, this can be used on a standard fly fishing nymphing rig.  

Try this fly and you won't be disappointed.