Here are some abilities that Melkor/Morgoth should have on his profiles:
Fire manipulation, heat manipulation, ice manipulation and smoke manipulation (when he came to arda his crown was made from smoke and fire, and he's body was made from ice), absorption (with his spear drained the light of the two trees), darkness manipulation (created a huge shadow over a continent), shape-shifting, corruption, large size type 2 normaly, type 4 when he came to arda, size manipulation, sound manipulation, probably vibration manipulation, magma manipulation (created a huge lava storm), Low Godly regeneration, intangibility, Incorporeality, lighting manipulation, master manipulator, master hand to hand combatant, curse manipulation, immortality types 1, 2, 3, 4, probably 5 and 9, water manipulation, magic and concept manipulation (created the concept of dark magic), telepathy, non physical interaction, flight, precognition, energy manipulation, Air Manipulation, forcefield manipulation, fear manipulation, soul manipulation, empathic manipulation, invulnerability, poison manipulation, illusion creation, transmutation, astral protection, self sustenance type 1, 2 and 3
True Form/Before he came to Eä: all previous abilities plus avatar Creation, matter manipulation, Acausality Type 4, creation, nonexistence physiology, Higher Dimensional existence, Aura, Large size type 8 possibly 10, Chaos manipulation (created the concept of discord), light manipulation (appeared as light)
Resistances: heat manipulation, magma manipulation and fire manipulation (endured three silmarils on his forehead), void manipulation (existed in the void of non being), concept manipulation (Ainur couldn't do anything to each other with conceptual battle), time manipulation (exists before time was created and completely transends it), cosmic radiation (can live Arda and enter outer space), soul manipulation,