Been wanting to do this for awhile now. Basically a Thundercats 2011/Voltron crossover.
Turns out one of Lance’s ancestors was a Thunderin (a.k.a a thundercat) which he only finds out when he gets zapped by a disgruntled Galra druid. Turns out the druid was trying to devolve him, but it had a different effect and made his dormant Thunderin genes dominate.
Unfortunately for Lance the Thunderin have been extinct for a LONG time, even before the Galra destroyed the Alteans homeworld 10,000 years ago, so no one really knows about their abilities or much about them.
I based Lance on a mountain lion/Cougar, cause I though the color scheme suited him. Also the top right is him dressed in a Thunderin outfit.