Primary spirits have one of four types: Attack, Shield, Grab, and Neutral. Attack is strong against Grab, Shield is strong against Attack, and Grab is strong against Shield; Neutral does not have any advantages or disadvantages against other types. Primary spirits cause the equipped fighter to deal 1.3× damage to fighters equipped with a primary spirit of the type they are strong against, but only deal 0.85× damage to fighter equipped with a primary spirit of the type they are weak against. In spirit battles, the opposing spirit is always assigned a type, even if it is a support spirit, and the puppet fighters experience type effectiveness accordingly (even though they are not actually equipped with a spirit).
Primary spirits have two main stats, an attack rating and a defense rating, with the spirit's listed power being the sum of those two stats. The primary spirits listed power can be further increased by the skill that it has, any support spirits it has equipped, or a style that has been taught (in some cases a style may decrease the listed power). Primary spirits also provide a number of slots for support spirits, ranging from 0 to 3 (Primary spirits that do not have any support spirit slots often have higher stats to compensate.) If a primary spirit is from the same series as the character equipped with it, it gains a further 1.1× (10%) power boost.
Additionally, primary spirits may have a trait, which applies an additional effect to the equipped fighter. This trait can be either positive or negative.
Some primary spirits can be enhanced at level 99. When enhanced, it becomes a new spirit with a higher rank and stats, and gains a trait (as enhancability counts as the unenhanced spirit's trait). Many traits of enhanced spirits are otherwise exclusive to support spirits.
Primary spirits' attack and defense stats modify how much damage is dealt and received by the character, but do not affect knockback dealt, and are not factored into the knockback formula. For both stats, a value of 0 results in no change from base damage.
In addition, increased attack will cause smash attacks to charge faster, while increased defense will improve shield regeneration, reduce shield depletion, and reduce the stun duration after a shield break. Because of the nature of these functions, defense is a more effective stat in terms of raw numbers, in the sense that a defense of 1000 is stronger than an attack of 1000 (which is the case when stats are equal at any value). However, defense is also slower to rise as its magnitude increases, whereas attack rises at a constant rate.
List of primary spirits