Wheeeeeeljack! Here he is, he was asked after/about on tumblr. So I did him.

• Wheeljack walks primarily on all fours, using the armoured backs of his main hands to support his front half. Due to the angle of his back legs, Wheeljack has trouble walking in a bipedal motion, it’s not impossible, but more trouble than it’s worth. Walking on his hind legs only causes him to wobble from side-to-side harshly among other weirdness to his gait.
• His head fins do indeed, light up, when he talks. Even when he whispers except then it’s incredibly dim.
• The smaller secondary arms you have noticed on Wheeljacks shoulders have been altered. Wheeljack has placed ‘gloves’ on these hands, giving them the appearance of being webbed, he did this as cupping them against his chest makes an excellent ‘pocket’ for him to hold onto many little odds and sods while he works on his latest projects. Underneath he has spindly fingers.
• Wheeljack is very excitable and loves to dive right into projects and ideas.
• Has been friends with Perceptor for an exceedingly long time.
• While at the Cybertronian version of a sort of “science academy” Wheeljack incorporated Shockwave into his friend circle creating a tight-knit friendship trio.
• He and Perceptor were instrumental in helping Shockwave overcome some issues and begin to accept himself more. Wheeljack would make it a mission to try and get Shockwave to laugh at least once a day.
• Regarding Shockwave he was intially incredibly happy some mech with plenty of financial backing picked up the fellow cyclops to make him a lead scientist. While Perceptor was more upset at the sudden loss of contact with their friend Wheeljack refused to hear it and optimistically brushed it off as “He’s in a new super-big fancy place now! It’s not deliberate Shocksy is probably just mega-cusy with all of the new stuff he’s got! You know how he is with new places, give him a while!”
This only made the hit harder when he eventually saw Shockwave again.
During the war.
Witnessing the stoic hateful mess Shockwave had become under Megatrons control tore Wheeljacks spark to shreds.• Wheeljack and Perceptor have tried many times to try and ‘reach’ Shockwave and ‘bring him back’ during the war, the attempts have always failed and lead to many heated angry moments between the two scientists. Probably a good thing they never found out their attempts occasionally did touch upon some of Shockwaves forcibly locked away emotions.
• Due to this Wheeljack, despite any of their arguments, is incredibly protective (and somewhat clingy) to Perceptor, the Dinobots, and others he views as friends. Perceptor can usually get him to stop this behaviour, knowing it stems from guilt.
• Before the War on Cybertron Wheeljack occasionally got scientific apprentices handed to him due to his eagerness to spread knowledge and also learn more himself. One such apprentice was Swoop, after Swoop never showed up Wheeljack went hunting for him.
• Wheeljack had immense trouble trying to find Swoop and went to the council in Iacon to see if he could be allowed records of Swoops transfer papers. He was helped by a spindly mech with a somewhat monotone voice who said they’d seen that name go towards Kaon,
• This is how he ended up in brief contact with Grimlock, learning about Grimlock, Swoop and a couple others torture being used as guinea pigs for tests. Mortified by this news Wheeljack had tried his best to get into Kaon to find a way of freeing them.
• He was halted by a now denounced member of the Scientific community who passed word to him that Swoop would be fine some rising voice named Megatronus was vowing to make Cybertron a better place and liberate mechs from their current state of society. After all this mech claimed he knew what it was like to lose a friend…
• During the war it was these memories and the knowledge of what happened that lead Wheeljack to hunt down the Dinobots upon their disasterous escape from Shockwaves lab. Knowing part of their history and some names allowed Wheeljack to get in close to them and help them regain some control over themselves.
• The group protected Wheeljack from an attack from Shockwave but received terrible damage in the process. After a lengthly discussion (and lots of begging) Wheeljack got Ratchet to help him fix up some life support pods for the Dinobots, keeping them in stasis until they could one day be repaired in full. He was so protective of these pods, he made sure to sneak them onto the Ark before it was launched so they would remain with him.
• Doggedly loyal to his friends. He’ll never lose another if he can help it.
• Easily loses himself in sources of knowledge.
• Keep an eye on him else he might start tinkering with various objects.
• Often needs something to fiddle with during meetings, presentations, etc to help him focus.
• Invents and creates new weapons, items, machines and devices to help the Autobots in the war, or just in general really.
• Perceptor and others refer to him as ‘remarkably flammable’. He’s no more flammable than any other mech in reality.
• Although, he probably has this ‘reputation’ due to the fact his creations have a high chance to explode when he first makes them. That is a bit of a problem when your enthusiasm sometimes leads you to forget things.
• Never lets this bother him though and will get straight back to working on his inventions. Ratchet has had to drag him out of his workshop to repair him before when the Inventor decides to disregard potential explosion-related injuries in favour of continuing his work.
• Can jump far.
• Is a sucker for big, tight hugs and claims Shockwave was good at them.
• Does occasionally “baby talk” his creations.