Good god, so many of those look like OCs. TAKE IT AWAY!
[Ahem] Sivir, maybe (Sailor Mars) Sivir comes off to me as tomboyish, even considering she's not a Battle Mistress anymore, but rather a bounty hunter.
Kalista (Sailor Saturn) Sailor Saturn used a spear and her attacks were associated with death.
Soraka (Sailor Mercury) Because Moon was already taken.
Diana (Sailor Moon) For the most obvious reasons in the universe.
Riven (Sailor Jupiter) Because someone has to be.
Morgana (Sailor Pluto) Never mind. She already has too many skins.
Lulu/Annie (Sailor Chibi Moon) Annie has too many skins, too.
LeBlanc/Lissandra/Elise (Sailor Pluto) (Queen Beryl) Look up some artwork of Queen Beryl. She has a scepter/staff like LeBlanc, she's an evil queen like Lissandra, and there's been more than one storyline where the evil villain du jour steals people's souls for reasons somewhat similar to Elise.
Nami (Sailor Mercury) Never mind, it won't work. Nami doesn't have legs. The Zettai Ryoiki WILL NOT WORK!
Ashe (Sailor Mars) Sounds weird, but Sailor Mars was a good shot with a bow, so there's my line of logic.
Twisted Fate (Tuxedo Mask) No one else fits the bill, and he's the most appropriate. He's the cool, suave, mysterious guy who throws small objects and shows up out of nowhere when you least expect him.