Oppo Rancisis was a Force-sensitive Thisspiasian male Jedi Master who served on the Jedi Council during the High Republic Era, Invasion of Naboo and the Clone Wars. He was known to be one of the wisest members of the Council. He was respected for his quiet wisdom and devotion to the Force and was a survivor of the initial Great Jedi Purge.
Oppo Rancisis was born on the rocky temperate world of Thisspias to royal parents and was the heir to the Thisspiasian Blood Monarchy. Although he was of royal heritage, Rancisis joined the Jedi Order at a young age and became the padawanlearner of Jedi Master Yaddle. At some point, Rancisis was offered the throne of the Blood Monarch, but he declined and chose to continue a life of service as a Jedi instead.
Oppo was force-sensitive and had very highly developed force powers he could utilize in combat. He was also very adept with his lightsaber, and a formidable foe in hand to hand combat as well, because of his four arms and long tail, with which he could make surprising strikes on an opponent. When in battle, Rancisis could use his tail as a potent weapon when he was forced to defend himself.
Rancisis was an excellent strategist and top Jedi military advisor, with his Jedi-counseled military tactics being cunning and effective.