Darth Tyranus, known to the galaxy as Count Dooku, was displeased. His new master had ordered him to take over a rogue Jedi project to create an army for the Republic. It was a foolish idea, create an army to fight droids, it was the job of a servant, not a proper Sith. So as he thought about his plight, Sith Lords don't brood obviously, he considered his options. Create a weak army? No, his master would see right through that. Create a disloyal army? No, that would ruin the point.
Suddenly Count Dooku jumps from his seat, startling the pilot droid next to him.
"That's it! He hates non-humans, like most Naboolians." Dooku shouts. 'But what species? Duros? Too generic, Gungans? too obvious. Perhaps a Togruta, that's not bad actually but they would need expensive armor. A Hutt? Now I'm just fooling myself, they are tough but I can see the endless infighting already, wait, I know.'
"Set a course for Kashyyyk!" Dooku commands.
"Yes Tarfful, I'm looking for an adventurous young Wookiee warrior, willing to help in a secret project to aid the Republic." Dooku says imperiously as he sits at a massive wooden table.
"General Tarfful wonders why this project must remain secret from the Chancellor and the Jedi?" A protocol droid asks in a calming if emotionless female voice.
"Master Sifo-Dyas was insistent that if they knew the Republic's enemies would strike before the project was ready." Dooku explains.
"General Tarfful understands and recommends the young Chewbacca." The droid translates.
"Excellent, I would like to meet with him at once." Dooku says with a politician's smile.
"Wookiees are quite an unconventional species, we've never cloned one before." Lama Su, prime minister of Kamino says diplomatically.
"Indeed, but their natural loyalty and strong bodies will save money in armor design and mental programming." Dooku counters.
"Indeed, we shall move forward then, but I would request an optional substitute from a more conventional species be acquired? Perhaps a force sensitive one?" Lama Su asks.
"I will look into it." Dooku says, thinking about a female Dathomirian he had heard about.
"Thank you for your business Tyranus." Lama Su says with a slight bow.
Dooku merely tilts his head before leaving with an elegant sweep of his cape.
"How are we going to import that much wood?" A Kaminoan asks nervously.
"I don't know, we might have to grow it here, perhaps the subjects can do it." Another Kaminoan retorts.
"That could work, let's bring it to the director." The first Kaminoan says.
"We had some initial trouble adapting our systems to such an unconventional species, but in time they proved to be the best clones we have ever produced." A Kaminaon scientist says proudly to a curious Obi-wan.
"Indeed, you must be proud." Obi-wan says.
"Yes, they struggled a bit in the beginning, but once we built the great greenhouses and cloned some of their native trees they and their hosts' demeanor improved. Their education retention and combat training scores improved by over twelve percent." The scientist boasted.
"And who was this host?" Obi-wan asks.
"A warrior by the name Chewbacca." The scientist replies.
"And where is this warrior?" Obi-wan asks.
"He lives here." The scientist says, before pausing as if remembering an interesting fact, "He did not request much in terms of pay, only that he may bring his family with him and that he have a say in their training."
"Did this warrior perform all the combat training?" Obi-wan asks, fishing for information about his assassin.
"Oh no, he preferred to teach craftsmanship and tree care. Tyrannus brought in a bounty hunter to help with training." The scientist replies.
"I'm sorry old friend." Dooku says with a sympathetic tear as the droids raise their weapons.
"Look!" Padme shouts as gunships descend from above, laser cannons and blasters firing.
"Around the survivors, a perimeter create." Yoda instructs.
"AAARRRRGWWW!" A wookiee shouts, and from the gunships jump an army of wailing wookiees, with mandalorian inspired dust masks and bandoliers.
The watching Separatist delegation could only stare in shock as wookiees tore apart droids left and right. A pair even lifted a Geonosian turret off its mounting and began using it as a massive wrecking ball.
"Ah, always refreshing, fighting with the wookiees is." Yoda comments as Jedi begin loading onto the gunships.
The battle was a landslide, the wookiees were simply too much for the droids to handle. Wookiee heavy troopers were able to destroy droid tanks with ease while Wookiee Commandos infiltrated and destroyed most of the Separatist core ships. Several enterprising wookiees managed to salvage the laser cannon from a spider droid and use it as a shoulder mounted weapon.
Palpatine struggled to hold back his anger as the wookiee army paraded on Coruscant, his plans were in ruins, the wookiees would never betray the Jedi! They didn't even have inhibition ships since they didn't work on wookiees! When he found his wayward apprentice he was going to have words and lightning, lots of lightning.
AN: This idea just came to me several months ago but I struggled to get inspiration to write it properly. Now here it is, the best clone army. I'm sure the Trandosians are already running for the unknown regions.