Last, of the Unicronian trio it's Scourge! and sorta the Sweeps...
Anyway, here's all his Extriverse info:

• Spent a week inside Unicron mutating into their current selves, upon which they hatched from fluid-filled chrysalises in their current state and left Unicrons body to enact his will.
• He’s bio-organic and functions differently enough from regular Cybertronians to be at the very least considered a sub-species.
• Was a part of the two-year long battle with/against/for Unicron.
• Suffered torment from Unicron if he so much as wavered outside of Unicrons commands and desires.
• When Unicron was defeated, he, like the other Unicronians became inert for a few months after having their ‘primary power source’ taken away.
• Like his fellow Unicronians Scourge and his Sweeps have a “Garbage Gut”.
• While Unicron was alive Scourge and the others had seemingly unlimited strength and power, now he’s ““dead”” their power is noticeably weaker but they are still forces to be reckoned with.
• Like other Unicronians he can make his optics appear to be ‘aflame’, this is purely an aesthetic effect.
• Their tails are not prehensile.
• Only the Unicronians seem capable of telling the Sweeps apart instinctually. Scourge can do it perfectly, however, Cyclonus and Galvatron have made mistakes a few times.
• The Sweeps are all utterly identical, however, Scourge is distinguishable by his larger crest, extra tail fur and claw tips on his wings.
• The Sweeps are divided up into numerous ‘packs’ each lead by their own ‘alpha’, however, Scourge is still the boss of them all. Sometimes gets him jokingly referred to as the ‘alpha-alpha’.
• Sweeps can be distracted with a laser pointer. Scourge can be too sometimes but good luck getting him to.
• Scourge and the Sweeps have optics that are unnervingly ‘organic’ looking. Said optics are also reflective.
• When Scourge and the Sweeps argue amongst themselves it sounds like THIS. This has kept many a Decepticon up at night if they so happen to be too close to the argument. Thankfully they don’t make that noise when arguing with any Decepticon though on the rare time Scourge ‘argues back’ with either Galvatron or Cyclonus he will make that noise and get an equally horrible sounding growl/roar/noise in response until the matter is ‘settled’. No one's sure if they can understand each other when they make such ungodly noises or if it's just a 'competition' until one backs down.
• Sweeps like to cuddle together in a pile and sleep.
• Rarely something called a “Sweepcub” can be found which is as the name implies a “baby” Sweep. No one is quite sure how or where they come from or are made, many Decepticons have made bets and theories on how they come to be, but are all too terrified of the possibilities to actually ask or really want to know, though it does ‘seem’ to explain why there’s a varying number of Sweeps around. Scourge seems to find great amusement in the 'theories' circulating around the Decepticon base.
• Scourge acts somewhat grumpy and sour but that seems to be his default disposition and isn’t actually being nasty as some might mistake it.
• Scourge himself is a remarkably ‘simple’ mech, by which I mean, a full tank and shelter is enough to keep him happy and content, during which he can be fairly pleasant/tolerable.
• Despite the concern and confusion about where they come from the attitude towards Sweepcubs is the same that a human might have towards kittens.
• The Sweeps are more cowardly than Scourge, as if they’re aware they seem to fill out some kind of ‘disposable clone’ role in the galaxy. This has also occasionally lead to a Sweep being rebellious but it never lasts long nor usually go past the stage of them ‘talking back’.
• Their toe beans are soft. Awfully so. Why does a semi-organic abomination get such soft peets? Curse you Universe!
• Sweeps and Scourge can communicate certain things and certain signals to one another using their tails alone.
• Their sense of smell and taste is better than their cohorts but is primarily used in tracking (or claiming they can sense others fear).
• Scourge calls Galvatron and Cyclonus ‘filthy’ if they so much as smile at each other. It seems to be an in-joke among the trio.
• Their claws are naturally that colour.
• They purr and growl just like cats, can be found with a ‘blep’ like cats and can even have cases of ‘the zoomies’ too.
• Scourge and the Sweeps display a pack mentality which is fine amongst themselves but when this mentality goes and includes other Decepticons (often if they are on a mission/working in a team with them or if a ‘con just happened to be nearby and get ‘swept up’ into their group) it tends to weird them out to be protected and guided by this weird pack of overgrown CyberCats.
• They even groom in a similar manner.
• Capable of bipedal and quadrupedal movement.
• Seems somewhat ironic that their ‘robot mode’ and behaviour is the most animalistic of the trio yet their ‘alt mode’ is the most ‘vehiclular’ of the three.
• They have collections of animal pelts and bones form creatures they have hunted and killed. It is not uncommon to find one or two wearing such items.
• Despite not needing to as it is primarily thanks to their anti-grav units and jets they like to ‘flap’ and ‘beat’ their wings in-flight.
• Yes, fluffing up and flaring their wings is something they do as a ‘threat display’.
• Scourge didn’t actively try to take control in “The burden hardest to bare”. The Matrix became energised after the unwanted attempt at using it and the energy it expelled (that came slightly delayed causing only Scourge to be affected) did not mesh well with his Unicronian energy at the time and caused a negative reaction, especially as he was unprepared and it wasn't 'connected' properly, and turned Scourge ‘wild’.