Thanks to fellow Seibertronians Cyberpath and Sabrblade, we have links to both the pack in comic/manga that comes with Transformers Legends LG56 Perceptor and LG57 Octane, as well as a plot summary for the Perceptor comic.
Below you will find links along with some highlighted panels. The Perceptor comic heavily connected to the G1 episode "The Face of the Nijika", and answers how Perceptor became just a head (since in Japanese continuity, the actual robot characters are just the small bots that Transform into heads). It also confirms that this is indeed G1 cassette Ramhorn and we get to see how Ramhorn went from being a cassette to a mini tank.
The Octane comic (yes, he is actually called Octane on the box), shows how Starscream takes over Octane's body in this bit of continuity. The toy comes with an extra clear plastic head representing Starscream's ghost.
LG56 Perceptor --
LG57 Octane --
Here is the summary for just Perceptor's comic:
TFWiki wrote:Having heard that the Legends World was created by the Zamojin, Perceptor travels to the dimension in search of his old friend, Katsu Don, whom he's lost touch with and worries about. Highbrow looks forward to investigating the dimension's mysteries together with his fellow scientist, though Perceptor's first duty is to fix up Ramhorn, injured in battle to the point where his cassette mode is beyond repair. Perceptor replaces it with a new tank mode, and while Ramhorn hates it, the scientist insists that he made the right choice giving him a more mobile altmode is better. The group is then interrupted by none other than Katsu Don, who says he's here to "take back Nijika" before tearing Perceptor's head off and running off with it. Highbrow and Perceptor's colleague Minerva are ready to make chase, but Ramhorn warns them that the Zamojin are strong and that they should bring some extra firepower in the form of Perceptor's body.
Katsu Don brings Perceptor to the headless new body of Nijika, damaged in a previous battle, and, having recalled that Perceptor's parts are compatible with hers, attaches the panicking scientist's head to it. The process is interrupted by the other Autobots, who have reconfigured Perceptor's body into its rarely seen tank mode, and a combined barrage from both it and Ramhorn distracts Katsu Don long enough for Perceptor to remove his head from Nijika. He returns it to his original body and takes aim at Katsu Don using Ramhorn's third mode, a handheld weapon, and the Zamojin retreats, swearing he will fulfill his dream of creating a full-scale Nijika someday. Admitting that he wasn't actually going to open fire on his old friend, Perceptor hopes that Katsu Don will someday, on a night of falling stars, find the right path again.
After returning to Axalon, Perceptor figures that since his head was already separated, he might as well convert it into a small robot and live a comfortable, human-sized life. Unfortunately, this makes it less comfortable for him to use his microscope mode, as he now has to stand on Minerva's head just to look into the lens.
And here is the summary for Octane's comic.
In the year 2022 of the G1 World, crazed stalker Lunaclub catches up to her beloved Starscream and cuts his head off, and while she's surprised that he survives thanks to his half-ghost form, she doesn't mind since it means she can kiss him all she wants. Starscream cares little for her affection and more about going to the Legends World so he can become a Headmaster and regain his mobility, a plan that catches the interest of Moonheart, who harbors her own feelings for Soundwave and wants to go see him.
Meanwhile in the Legends World, known pervert Tigatron has a found a kindred spirit in the Headmaster Octane, and the two make plans to seek out pretty ladies, hire them to appear in sexy videos, and get rich. The mention of profit attracts Trickdiamond, who offers to be the manager of their budding business, but instead she gets dragged into modeling for their first video. It becomes is a huge success and the three make enough money for Octane to buy a transtector, only for a ride on its jet mode to be interrupted by an attack from Lunaclub and Moonheart, followed by Starscream materializing inside the plane in a ghostly Headmaster form. Intending to destroy Mayor Megatron and become ruler of the Legends World, he takes control of the transtector and crushes Megatron's Tankor Drone guards with its truck mode before transforming into robot mode and grabbing his old leader.
However, Octane has installed a safety device to prevent his body from being stolen and presses a switch on its stomach that causes it to stun and eject Starscream. He reclaims the body, and when Lunaclub and Moonheart take him on, he defeats them both with a flamethrower blast, announcing that he won't let conflict disturb this peaceful world where he can make videos of pretty girls. Moonheart flees to go search for Soundwave while Starscream, true to form, crawls up to Megatron and begs for forgiveness, and is punished with having to appear in one of Octane's videos together with Lunaclub. Trickdiamond is relieved she doesn't have to do it anymore, but the new video doesn't sell at all and they end up using her as a model a second time.
version of POTP. 
