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In episode 19 of OVA 3, it is revealed that Misaki will become -- and perhaps already is, to some extent -- the "Counter-Actor" (ウンター アクターカ, Kauntaa Akutaa), the sentient sum total counter-force to all of the Choushin's actions. From what has been seen of the counter-actor, Misaki has the ability to cause harm to the Choushin -- Washu, Tsunami, and Tokimi, the three goddesses who created all of existence-- with an immense rage over their meddling. There has to be a counterbalance; for every action, there must be an equal and opposite reaction.

Misaki becomes the Counter-Actor thousands of years into the future on Jurai when both Azusa and Funaho have died, causing her to go mad. Z, a man capable of generating Light Hawk Wings like Tenchi, went into the future to bring the Counter-Actor to do battle with the Choushin.

Counteractor

The Counter-Actor strangling Tokimi.

When counter-actor Misaki attacked, nearly strangling Tokimi's lower-dimensional shadow, and viciously striking Tsunami when she tried to reason with her, Tenchi appeared in a glowing form to calm her down. The two of them kissed and disappeared from view. Earlier on, Kajishima's True Tenchi novel "Jurai" foretold Misaki's future long before her third OVA appearance, reading that someday "the galaxy will know the true terror of Misaki" and that "only Tenchi could stop her."

Her appearance does not fundamentally change, but she becomes clad in some kind of black and red quasi-matter that distantly resembles a dress and long gloves -- Misaki could not endure the pressure of the energy that was for various reasons contained within her, so she ended up going on a rampage through Jurai. To put a stop to it, Juraian fighters at first didn't want to wound her mortally so they just shot at her limbs. Since she was completely unperturbed by that and refused to stop, the Emperor of Jurai at that time finally had enough and issued the order to eliminate her. So they struck and shot at places like her heart, head, and neck, resulting in her appearance. Additionally, her face grows almost unrecognizable from how her rage distorts it.

Counteractor Attacks-250

Misaki as the Counter-Actor, attacking Tokimi.

The full capabilities of the counter-actor haven't been explained, but it seems that she can negate some of the abilities of other beings. Most noticeably, the presumably omniscient Choushin seemed unable to notice her proximity to Tokimi, and the normally unequalled power of the three Goddesses could do nothing to stop her in the third dimension without completely destroying it.

This could also explain how Misaki was able to harm Ryoko both unintentionally (with her hug) as well as intentionally (when she started tugging on her face). It would be assumed that Ryoko couldn't be hurt by these actions, but Misaki's abilities as the counter-actor -- even if not fully awakened -- may be the reason for this.