And that must be Metroplex at the top too....I remember him.

Yup thats metroplex, got him for my birthday many years ago, he is still complete and in fine shape too.

The year after that I got trypticon :)

The last two at the top look kinda K marty.

Their both original Transformers, just not 2 of the better ones.

The left one is Powermaster Optimus Prime, the first version of Prime where the cab and trailer can combine in a larger robot.
Though the concept was cool it was sadly not realised very well making for a practically non posable badly proportioned robot with too short looking arms.

The other one is Ultra Magnus, though very cleverly designed he is made of a less gleamy looking cheaper kind of plastic with too little variation in colors.