A Sue, A Sue, My Kingdom for a...
Maretseger Suenetnofret of Ma'ahesue, Stargate SG-1
She is a good Goa'uld, of course, whose slaves, Jaffa, subjects, and the 17-year-old Egyptian princess who has been her host for several thousand years, all love her for her surpassing wisdom, her stern but just... err, justice and her surpassing beauty: she is tall, slender and sylphlike, with floor-length obsidian locks and ageless onyx eyes.
She defends her kingdom of a hundred planets - each far more beautiful than the Ancient Egypt that was inspired by her peerless home world of Ma'ahesue, and far more advanced than any other in the galaxy, including Earth - against all the System Lords with ease and brilliance (and no bloodshed on her side).
Of course, when SG1 and SG2 stumble into her world, she refuses to give them technology, but after falling in love with Dr Daniel Jackson she declares Earth to be under her personal protection (far more powerful and respected among the System Lords than the Asgard, of course), and prepares to take him as her Consort and Prince, to live in romantic royal bliss with him in her Palace of Everlasting Light.
...Unfortunately for her, her evil and ungrateful First Prime is wildly jealous, tries to kill her Prince-Consort-to-Be and his friends. And his formerly careless and undeserving friends/teammates don't properly appreciate her lectures on how undeserving of Daniel they are, how good and noble and pure and selfless and rent by self-doubt and inner pain he is - and decide said Prince-Consort-to-Be is better off back at home fighting proper evil Goa'uld. In the battle, she is shot by both sides trying to protect her beloved and dies... tragically not in her beloved's arms, as he, umm, dies too.
Oma Desala brings him back - again - but is also jealous of the peerless Maretseger and afraid of the unrivalled power such a brilliant Goa'uld could amass even if briefly ascended. Maretseger's First Prime and Prince-Consort-to-Be make peace over her grave (well, in front of her amazing gold pyramid, the greatest in the entire galaxy) and swear to be friends and allies forever in her name...
~oOo~
Then Daniel woke up, and made a solemn vow NEVER to eat O'Neill's Famous ThreeCheese-n'PickleBurger before bed again.