Drink it in, this is the most complex design/drawing I'll do. Everything else will be simplified hahaha.
It's how he appears in my Bayverse follow-on/finisher fic: A Heretic's Gamble

Name: Cyclonus.
Alignment: Decepticons.
Alt. Mode: Large Cybertronian Space-Jet.
Height: 57-60ft~
Voice: Jörmungandr from God of War Except he only ever speaks Cybertronian, almost never speaks “Human”.

Back Story:
Cyclonus is the guy most people feared, be it his sheer size, intimidating appearance, or the deep rumble that constituted his voice he tended to make everyone nervous.
Thankfully he didn’t speak often and was content to stay in his quarters or in a small corner of the base he had ‘taken over’ to pray and worship quietly.
That was the be all and end all really.

No one realised he never worshiped Primus until it was far, far too late…

On some faraway planet horn-like spires began jutting out from the ground.
It was the invisible signal for him, with a bellowing cry:
“PRAISE UNICRON!”
His former team had barely any time to flee before they became contemporary art as tribute to the great Unmaker.
Even the ones that did get away did not escape their fate. It’s hard to escape when the guy you’re fleeing from can fly in space and has absolutely no regard for safety at all.

Once his former crew were slaughtered and ‘offered up’ Cyclonus finally left his post to answer the call of his lord.

Crashing down on Earth all he saw was filth.
Disgusting filth entombing the glory of Unicron!.
He prayed to Unicron vowing to free him of this wretched atrocity.

Like a divine answer a voice lead him to a measly sand-covered area of the planet but, like a glorious arrow to the sky a great horn grew from the ground!.

He was not alone either.
Cyclonus was greeted by two beings he’d never seen before, initially he was about to kill them, but once more the divine word of his god spoke to him.
They were his new team, and he will work with them.
Quintessa and Galvatron.

It’s time for Unicron to rise.

Personality:
Cyclonus's personality is hard to pin down, whatever is left of it is locked away behind fanatical, zealous worship of Unicron and anything relating to him. He is keen to prove his worth and dedication to Unicron and any of Unicron's 'chosen ones'.

Beneath it he is pained, almost wishing for the end of all things to come soon. Life is worthless and he knows it for a "fact", his worship almost feels like a desperate attempt to escape something.

Note/Extra/Abilities:

• It’s a good thing he rarely bothers speaking any Earth language, his absurdly deep rumble of a voice makes him very hard to understand and humans just ask for a translation anyway.
• He’s a walking biohazard. No, really. Cyclonus has what is essentially a ‘crop’ (like birds) and said crop is filled with… corpses. Yes, Cyclonus likes ‘eating’ his victims but often leaves their chewed up remains stored within him. They are not immune to rot in there. Just think of it. Within his body lay several rotting corpses stewing in their own juices. This naturally has lead to the rise of many, many unpleasant diseases and bacteria Cyclonus seems immune to.
• This makes his saliva toxic and his bite quite deadly.
• If push comes to shove he will forcefully eject a chewed up limb or body part and spew it out at an enemy.
• His tail wags when he’s happy. He does try not to when he’s “being serious” but a bit of a wiggle may just get through.
• Makes sounds like an Elk (loud), and yes it’s just as terrifying as that.
• Likes star-gazing.
• Utterly faithful to Unicron, if Unicron says Cybertron has to go then Cyclonus will make sure it GOES.
• Doesn’t open up much if at all.
• Refuses to acknowledge anything on Earth, though maybe he should. Especially Bovines.
• Doesn’t trust Quintessa, Galvatron on the other hand… he confuses him.
• Is pretty berserk, wild and uncontrollable when going.

Design notes:

• The tail was initially added because when I started the pencil sketch of this my mom saw and decided to make a joke about how I always used to draw dragons with stupid long tails and the like and “my god something without a tail!” so I added it as a return jibe, but then I liked it too much.
• The Raptor claws also came after that as I ended up giving him a bit of a ‘dinosaur’ feel.
• The horns just… happened, can’t say much there…
• Considering the skeletal face and tail, the sharp claws, the big fangs… giving him butterfly-like wings was intentional as a deliberate ‘contrast’.
• Yes, the crotch is deliberate, and also harks back to the ‘dinosaur’ thing, it’s like the Pubis bone on dinosaur skeletons.