@Background Pony #D54E  
Let’s see, Teridax is considered the “brother” of Mata Nui, who grew envious of him.  
Luna is the sister of princess Celestia, who grew envious of her.  
The only difference is that Teridax defeated Mata Nui and Luna/Nightmare Moon was banished.  
So, yeah, they’re pretty similar.

Agreed with everything but Sombra. Much more fitting to be Makuta.

So, by the fact that the Shadowbolts are the Rahkshi, wouldn’t that have made Nightmare Moon Teridax?

According to the film, Sidorak was far too cowardly and narcissistic to even come close to the ruthless tyranny of King Sombra. As said below, if anything Sombra would be closer to Teridax and Sidorak…Well, I don’t think we’ve had a truly cowardly antagonist in MLP. Perhaps Blueblood, if that guy ever actually got something done.
 
As for Discord being Karzahni, I can see the logic there but I’d sooner associate him with Vezon. Now that he has his interdimensional powers, the chaos can only spread farther and farther.

No, Sombra would more like the Makuta (even though his letdown).  
Sidorak was the king of the Visorak but didn’t have enough leadership, also he was very coward (he tried to make others do his job to not risk his life, for example, finishing Keetongu).  
I highly doubt that Sombra would have any problem in facing the enemy, even though it could be suicidal (Makuta/Takutanuva was crushed by Mangaia’s door in the first movie, but lived. Sombra exploded because of the crystal heart, status unknown, but probably dead)

I love how one of the whatsits has a different helmet like how one of the changelings has a helmet at all.

@Joshua  
I agree. Both King Sombra and the Makuta made an effort to ensure they maintained their power and control through traps, manipulation, and mind-control.
 
Besides, Sidorak in the movies is portrayed differently from his other media counterparts. In the other media, Sidorak was competent, powerful, and a decent leader, while the movie portrayed him as some doofus who easily falls for Roodaka’s plotting.
 
Also, while we’re on Roodaka, both she and Queen Chrysalis are known to have turned the heroes against each other in some way: Roodaka manipulated Vakama into joining her - Chrysalis made everyone else think Twilight was just plothurt and crazy.

Oh PLEASE! Sombra is FAR to powerful to be like Sidorak. He’s more of a “Makuta” type to me.