• Mutagen Man: Simple, direct, and highlights the core power.

• The Alchemist: Evokes a sense of transformation and mastery over matter.

• Form Shifter: Focuses on the ability to change shape and form.

• Matter Weaver: Suggests a skillful manipulation of matter, almost artistic in nature.

• The Transmuter: A straightforward and powerful-sounding name.

• Elementalist: Broader than just matter manipulation, but still relevant if the powers include elemental transmutation.

• Molecular Maestro: Sophisticated and implies precise control over matter at a microscopic level.

• The Metamorph: Classic and evocative of shape-shifting and transformation.

• Atomic Architect: Suggests the ability to build and reshape matter at the atomic level.

• The Flux: A more abstract name, suggesting constant change and instability.

• Chronosmith: If the matter manipulation includes time-based effects, this name would be fitting.

• Reality Bender: A more powerful-sounding name, implying a wider range of abilities.

• The Sculptor of Worlds: A grandiose name, suitable for a hero with immense power.

• Terraformer: If the matter manipulation is used to reshape landscapes.

• The Quantum Weaver: Suggests manipulation at a subatomic level.

• Names incorporating specific elements: If the matter manipulation involves specific elements, consider names like "Pyromancer" (fire), "Cryomancer" (ice), "Geomancer" (earth), etc., but combine them with a descriptor like "Master" or "Lord" to indicate their control over matter. For example, "Pyromancer Master" or "Lord of the Cryo-Form."

These names offer a variety of styles and tones, from straightforward to more evocative and dramatic. The best choice will depend on the specific tone and style of your project.