After presenting Tao Trio for the series, of course Kyurem's fused forms. I mean why not, they're intriguing :3

as White Kyurem
Gender: Male
Movepool: Ice Burn – Dragonbreath – Fusion Flare – Ice Beam

as Black Kyurem
Gender: Female
Movepool: Freeze Shock – Dragonbreath – Fusion Bolt – Ice Beam

That's Kyurem when somehow succeeds to take down Reshiram or Zekrom. But that takes a lucky strike cuz it's two dragons against one so you can imagine how often this happens. :3
In this unique fused manifestation, Kyurem gets hold of their hearts and inevitably assume their genders and personalities, aka oddities, as well. But Kyurem is still Kyurem, he/she's still quirky, though gets a bit naughty or serious by becomining slightly interested on males as White Kyurem and rabid as Black Kyurem. After all, he/she the one who's on charge when though it's a mix between two dragons at time! This is the only time he/she can decently speak as well, but even though he/she's capable to communicate doesn't mean he/she wants to share his/her secrets.
Not any near of their original, solo form yet, but it's the closest shape.
He/she's easily, not counting Rayquaza's permanent mega evolved form, the strongest Legendary of all!
Defeating him/her in that conditions without mega evolution or by type advantages makes very difficult, if not impossible, to accomplish.