Being a fairy composed of over a thousand spirits grants him many abilities, most notably his skill to manifest the evil he emanates in the form of a black smoke.
Groggy: The term he utilizes when discharging the black smoke from his pores, in simplest terms this smoke is quite literally the embodiment of evil & cannot be grasped via conventional methods due to it being both a solid & gas (When it's convenient). For example when going on the offense the smoke will be a solid, whereas when taking attacks it's physical body will be incorporeal. This smoke tends to act as both a defense & offense for Ghost when in his host form due to it being when he is at his weakest.
Psycho Warping - Masterful at warping reality via his psionics on a metaphysical level. For example, he can cause illusions that are actually real, whilst also creating his own personal reality known as the Sokaiverse.
- Personal Reality - Again, Tamashi has in the past created his own reality within his mind known as the Sokaiverse, but if left unchecked it can spill into the real world.
- True Illusion Manipulation - As mentioned before, Tamashi can create true illusions in order to cause dread in most of his opponents/victims.
Spirit Bomb: I know, the creators of Dragon Ball Z are somewhere filing a copyright claim as we speak. Regardless this ability sacrifices a portion of his spirits to release a blast of power that is capable of leveling two, three or even ten story buildings depending on both the charge time and how many souls go into charging it's blast. ( Power varies. One soul amounts to a golf sized ball capable of leaving a dent in metal, so you do the math when applying an even larger amount of essence. )
Flight: In his true form wings protrude from his back & ribcage granting him the ability of flight. Increasing mobility substantially. (Although it should be noted he is capable of hovering in his host form for a prolonged amount of time.)
Fairy Dust: A technique he tends to keep his mouth closed about due to many considering the dust a fairy emits ' lucky '. Although for a Sluaghe the dust that excretes from his wings can be considered detrimental to ones health IF they allow said dust to coat a portion of there body. It starts with a tingly sensation before eventually disabling the use of a limb, depending on what else is covered the body begins to shut down until finally leaving one open to attack. In a sense it is a contact-poison capable of rendering ones body parts useless if left undeterred.
Summon Nightmares - Tamashi can summon these fragile but malevolent creatures, usually in large swarms, from the depths of his mind on the target, both in hallucinations and in reality.
Telepathy - Alma can cause hallucinations in others' minds seemingly at will, and speak directly to them without needing to be physically present as well as control others' minds.
Misc.: Teleportation, clairvoyance, regeneration, necromancy, fear manipulation.
The difference between his true form and host body is substantial, for instance a Sluagh is incapable of calling upon it's true power in the body of the husk it uses due to it placing a strain on the body. However in it's true form it can draw it's full potential which in Ghost's case resides in the speed from his slender physique/wings and magic derived from his Fairy heritage.