Impossible Toys has mostly made non-transforming figures, such as a G1 Nightbird figure and G1 Quintessons.
They have made toys for G1 Spike and sparkplug, in transforming "Exo suits"
They have also made a trio of human characters from transformers animated that are not in scale with the tfa toys, or even eachother.
Their "Valkyrie" figure is designed to look like G1 Arcee, and is pretty popular because of it. It was later repainted and given guns as a tfcon exclusive.
This is the story of a girl named Sari...