The other version of Unicorn Gundam...
Awakened:
Unicorn Phenex (one of 72):
Developed by Anaheim Electronics, the RX-0-2 Unicorn Gundam Banshee is virtually identical to the RX-0 Unicorn Gundam piloted by Banagher Links,
except for its color, more ornate V-Fin, and the lack of the La+
system. Prior to the "Banshee"'s assignment to Augusta Lab to undergo
gravity testing, it was assigned to the General Revil alongside the "Phenex".
While attached to the General Revil, the "Banshee" and the "Phenex"
encountered a "Sleeves" unit and engaged it in battle, where the
"Banshee" suffered significant damage to its chest which required it to
be overhauled. During the overhaul, the Banshee gained its golden
collar, making it resemble a lion even more

NOVEL:


At Augusta, Banshee is assigned to the captured but brainwashed
Marida Cruz. It first sortied at Dakar to capture the Unicorn Gundam
after Riddhe had confronted Banagher about the events of both their
family's complicated past. Banagher would then come to battle the
Banshee, in an attempt to snap Marida back to her senses and away from
Martha's influence. Later after Zinnerman and Banagher managed to bring
back Marida, this unit was recovered by the Federation and assigned to
Riddhe Marcenas, with Alberto hiding this act from Martha. During the
final battle, Banshee confronts Unicorn again and both activated their
NT-D. Banshee seemed to have an upper hand since Banagher was unwilling
to fight against Riddhe, whom he trusted. In the meantime, Nahel Argama
fires to cover Banagher and causes Riddhe to think that everyone is
betraying him, and thus aroused by anger he fires at the Nahel Argama,
but Marida blocked the shot with her damaged Kshatriya, dying in the
process.



The explosion of the Kshatriya's psycoframe lets Marida for the
last time tell Banagher to forgive Riddhe, as he was filled with hatred
and wanted to blast him out right away. She reminds Banagher that only
the unicorn and lion together would bring a new hope. She also tells
Zinnerman that she was glad to meet him. Zinnerman begged her not to
leave, but she said that she was grateful for his care of her and
satified. Riddhe eventually realizes what he should do. Banshee and
Unicorn later confront Full Frontal in his damaged Sinanju together, and
Banagher killed Frontal. Together with Unicorn, Banshee activated the
psycofield and blocked the laser fired from Colony Laser II. Then
Banshee joined to stop the attack from EFSF ultimately before the attack
was called off.

OVA:



The Unicorn Gundam 02 Banshee first appeared after the AMA-X7 Shamblo was defeated during an attack on Torrington Base. The Banshee was dropped from a Vist Foundation Base Jabber and descended upon the MSN-001A1 Delta Plus and RX-0 Unicorn Gundam. After disabling the Delta Plus, the Banshee secures both suits and brings them into the Ra Cailum.



Note: More of the Unicorn Gundam Banshee's history can be found on Marida Cruz page


Source:http://gundam.wikia.com/wiki/RX-0_Unicorn_Gundam_02_Banshee