Board Thread:Speculation House/@comment-14640999-20140724024429/@comment-25090813-20140724125925

I reckon any of the elders (Ozpin, Glenda, Roman, Oobleck, Cinder), could defeat her

Also after watching dead fantasy 8(?) preview it is noted that Naminé and Penny have extremely similar fighting styles, with the lasers and the floating swords/keys. Momiji is able to effectively counter and hold her ground against Namine due to simply speed and skill with her weapon.

Taking that into considerartion I reckon all of team RWBY, Pyrrha and Sun could stand against Penny but not defeat her.

This is all assuming she is not an Android but posssibly a cyborg (so part human)