GOW's Jormungandr, Pentious, Gary from Zootopia 2, Orochimaru, Lady Venamora from Astro Bot were all ones I considered.

Final snakes are Sssnacker from Kirby Forgotten Land, Slips from My Gym Partner's A Monkey, the block snake from...well...yeah, Noodle from Snake Pass, and Ekans as the delivery boy!
There were others I wanted to put in this but I just couldn't figure out how to make them work in the composition.

Also his ability is Strongest Jaw and it just doubles the power of all biting moves.

Now admittedly I do feel I ended up making more of an evolution/mega than an alternate form but I did always just want Mightyena to become more beastly under the blood moon.

If this should be an evolution then I will say it's done through corrupted moon stones called blood moon stones.

Full disclosure, the original idea was to make him like giga cheeked up with the box behind being held up by his mondo truck.

I sadly could not make it happen, I need more practice. One day...one day...

Honestly I think out of all of them, Grim Matchstick was my favorite to make a project with