Lorewise, I always wondered why we never weaponized primalfication against the Ascians. We're somehow against the concept just because it's similar to "summoning?" So what? Louisoix "summoned" the Twelve. On character creation we choose one of the twelve as our personal deity, currently only for a meager elemental resist bonus. We should learn primal transformations for them. From observing Ysayle, it seems there are no serious drawbacks to the process. You retain control, it only consumes a small amount of æther, and there are no lasting ill effects when the transformation is cancelled.

We would only need a reliable æther source, some type or auricite crystal to carry as a form of "æther battery." This could fill maybe once per IRL hour rather than with duty progress, and would act as the "personal LB" you seek. The transformation would confer stat buffs for its duration, and a one-time use of a special ability based on the deity and current role. For example, Halone would be a more traditional LB, performing a damaging spear strike as DPS, raising a shield for a self-damage resist as tank, and creating a glacial barrier around a target to heal while providing brief invincibility, yet disabling the unit for the duration, as a healer. Menphina, on the other hand, may give DPS the ability to briefly buff an ally, diverting a portion of the caster's damage dealt into bonus damage for the ally to discharge as they attack. Tanks would charm enemies within an area, as an AOE provoke, and briefly prevent them from attacking. Healers may place a global regen effect under the moonlight.

Every deity could have a fitting set of 3 abilities. Always good, but in different situations. Players may need to be given an option to allow them to change affiliation, but all abilities should be balanced and well-suited to the role.