For me, the first 3 come in mind is Razor Ruddock, Azumah Nelson and Junior Jones. Edit: Dwight Qawi as well
Razor Ruddock, he was crazy athletic and fast for his size. Very powerfully built with wide ass shoulders and thick quads and arms.
Alexis Arguello, and Carlos Zarate, both had the height and reach of a middleweight, fighting as low as bantam.
Qawi is the most unique to me because of the combination of lack of height with his very long reach. His height on boxrec is listed at 5'5 and a half which is short for a lightweight let alone a guy that competed all the way up at Heavyweight towards the end of his career. 71" was his reach which is about what you see on someone that is 5'11 or 6'0. Just over the weekend Issac Cruz fought Davis and was listed with a 63 inch reach. 63" is extremely small and a reach you would typically see of a fly weight not a lightweight especially these days.
Not as well known as a lot of guys mentioned but Kingsley Ikeke. He was literally nothing but arms and legs.
Yea, after Abraham then Pascal, the luster and oddity of his dimensions wore off and he just disappeared.