All Lions come from Ninja (Voltron and Ninjago Crossover)

In ninjago, the ninja are happy, they just defeated King Vangelis. They were hanging out outside, enjoying the night sky, waiting to see the Asteroid that was reported going to fly over them. With smiles their eyes watched as they chatted. Wu was proud of his ninja, they had gotten out of their funk from the season before and now were better than ever.

Misako came out to join them just as the Asteroid passed. He, her, and the ninja were all sitting on the ground now. Wu turned to Misako, enjoying her happy expression. The same expression he knew the ninja most likely had. He turned to his students, the six ninja he had come to love as his family, only to find them gone.
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The Lions of Voltron weren't always lions. The reason why the connected with people, the reason why they were practically alive, the reason why they had such great power was because they carried the souls of the six ninja. The ninja weren't always awake when the lions were powered, but were never awake during the ten thousand years. The Paladins controlled the lions, they didn't, they only gave the machines their power. But when they try their hardest, they can take over. Every decision a Lion makes without a Paladin or someone else, it's the ninja, sometimes on purpose, sometimes unconscious. They were the ones to choose their Paladins.
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After season 7 and before season 8, Coran and Sam Holt decided to do some experiments on the Lions to see if there was any hidden features and tools. They did come upon something, but it wasn't a weapon.

Green= Zane
Yellow= Cole
Black= Lloyd
Red= Kai
Blue= Jay and Nya
(Some powers don't match up, but who cares?)