Onslaught is a character introduced in Transformers: The Last Knight. He is a member of the Decepticons.
Personality & Character
Onslaught was among the Decepticons in T.R.F.'s custody. When the T.R.F. opted to work with Megatron and release some Decepticons to be part of his "crew", among Megatron's first choices was none other than Berserker. However, Berserker was deemed too dangerous, so Megatron had to settle for Onslaught, who needed high level clearance to be released. When released, he angrily bemoaned the small size of the T.R.F.'s doors, which he could not fit through. However, he was able to get his cannon through said door.
Onslaught joined the Decepticons on their hunt for Cade Yeager, and followed his leader to the human's scrap yard and then to a nearby town. They were met with some not-quite-unexpected resistance in the form of the Autobots Bumblebee, Drift, and Crosshairs and damaged in a trap set by Yeager. He attempted to catch the fugitive human but was ambushed by Drift and Crosshairs. He first lost his leg and took several shots in the chest before finally losing his "fat head" to Drift's sword.
onslaught's tow truck mode
Notes & Trivia
For his appearance in The Last Knight, Onslaught employed a retooled version of Long Haul's model, complete with new weaponry and tow truck kiddle replacing the original dump truck parts.
During Onslaught's one line of dialogue, he appears to have an alternate mouth design based off Brawl's (compared to what is seen during the rest of his screen-time) to accommodate the exaggerated words.
Onslaught's promotional TRF prisoner dossier bio states he is developing a new weapon called The Decapitator, presumably the large claw he wields in the film.