Ok there seems to be some confusion and misinformation in this thread. There are three types of reflect status effects:
Normal Riposte
This reflects a certain percentage of any damage absorbed back to the attacker including direct damage from special skills, slash attacks and tile damage. But this type of riposte cannot reflect status ailments like poison, blind, burn etc.
Elemental Riposte (Mitsuko & Ursena)
This kind of riposte reflects any special skills from said element heroes (ice and holy), which includes direct damage and other negative status effects. But tile damage and slash attacks from said element hero or monster don’t get reflected, they work as normal and can inflict damage on Mitsuko and Ursena.
Elemental barrier
For example, the ones you have for rare titans and challenge events. It reflects any kind of special skill (including status ailments) and tile damage back to your heroes of that specific element. Therefore monsters or bosses with a particular elemental barrier will never take damage from those elements.
Now, a ranger hero can pierce these status barriers on certain occasions. Hope this helps.