Talia (Onderon)

Queen Talia was the ruler of the planet Onderon. During her reign, she was in constant conflict with her cousin, General Vaklu. This eventually erupts into a short lived civil war, after Vaklu attempts to overthrow her with the help of the Sith, with the plan to have Onderon secede from the Republic.

Her main counsel was the Jedi Master Kavar, who also serves as one of her strategists, and is sought after by the Jedi Exile in his quest to find the remaining Jedi Masters.

The conflict of Onderon, and ultimately, Talia's fate, was settled mostly due to the intervention of the Jedi Exile.

Canonical Light Side choice
Due to the intervention by the Jedi Exile, Vaklu and his forces were defeated, and Queen Talia was able to survive, leading to a long-lasting reign. Vaklu was either imprisoned or executed (depending on the Exile's choice). She amply rewarded the Exile for his assistance, bequeathing several valuable artifacts used by her Force-sensitive ancestors. When the invasion of Telos occurred, she sent significant numbers of her royal guard to assist the Republic forces in repelling the Sith invasion.

Alternate Dark Side choice
The Jedi Exile's intervention swung the balance of the battle into General Vaklu's favor, as Vaklu's troops stormed the palace, and invaded the Queen's throne room. Jedi Master Kavar tried to stop the invasion, but the Jedi Exile, aided by the dark side's rage, defeated him in a gruelling battle. Queen Talia was subsequently killed, either by Vaklu's forces, or in a duel against the Jedi Exile (depending on the Exile's choice).

Ironically, even though Vaklu, the secessionist, came out victorious, he turned on his Sith allies, choosing to send his troops to Telos, when the Sith invasion commenced.