Doctor Finitevus

Starline is an anthropomorphic platypus with gray fur. He wears a brown glove with gold tips on the fingers—it was originally made specifically for his paw to hold the Warp Topaz artifact (a stone that distorts space and opens portals). After Eggman took the Warp Topaz, the glove was modified, creating Tricor. Starline's favorite outfit is a purple-pink jacket, dark boots with gold buckles, and orange pince-nez.
Starline has a rather contradictory image: on the one hand, he's fanatically devoted to Eggman, but on the other, he's driven not only by admiration for his idol but also by a thirst for personal recognition. He's cunning, cruel, and manipulative. He can manipulate someone's mind for thirty minutes by holding his gloved hand in front of their face.

Appearance
Before his transformation, Finitevus was a normal echidna with red fur and purple eyes. After an accident involving Knuckles' Chaos Force, he underwent a radical transformation.
After the transformation, his appearance changed dramatically:
The fur became completely white (albino fur).
The eyes acquired a yellow iris with a black sclera and crimson eyelids.
A mysterious yellow crystal with a spiral pattern appeared on the forehead, from which black lines radiate across the white fur.
A black outline formed on his chest, forming a crescent moon, reminiscent of the Guardians' birthmark.
He began wearing a long black cloak with white and black horizontal stripes on the inside, held in place by a large gold clasp bearing a crescent moon symbol. His wrists and ankles were cuffed with black cuffs with four gold rings, and his hands and feet were wrapped in slate-gray bandages, resembling mummified ones.
Powers and abilities
Finitevus is a brilliant yet mad scientist whose intellectual prowess puts him on par with such adversaries as Dimitri and Doctor Eggman.
His key ability is the ability to manipulate a distorted form of Chaos energy (black instead of the usual green). This allows him to replicate any abilities used by a wielder of pure Chaos energy. For example, he used Chaos Control to teleport.
He is also a master of warp ring technology for travel and combat.
History and interesting facts
The character was designed by Jonathan Gray, written into the story by Karl Bollers, and named by Archie colorist Rosario "Tito" Peña.