Spectral Resonance

"Spectral Resonance" allows the user to summon the ghostly spirit or Stand of a historical figure to fight alongside them. The summoned entity possesses the skills, knowledge, and abilities associated with that historical figure. However, the downside is that the entity retains its own free will, which can lead to unpredictable and potentially dangerous consequences.

**Abilities:**

1. **Historical Figure Manifestation:**

- The user can summon the spectral form or Stand of any historical figure they choose. This figure retains its appearance, personality, and skills from their time period.

2. **Skills and Knowledge Transfer:**

- The summoned entity possesses the skills and knowledge they had during their lifetime. This can include combat prowess, strategic thinking, or expertise in various fields.

3. **Enhanced Physical Abilities:**

- The ghostly entity gains ethereal, enhanced physical attributes. It can interact with the physical world, engage in combat, and use its skills to aid the user.

4. **Stand Manifestation (Optional):**

- For a JoJo's Bizarre Adventure twist, the historical figure can manifest as a Stand, granting unique supernatural abilities in addition to their inherent skills.

5. **Time-Limited Summoning:**

- The spectral entity remains summoned for a limited duration, after which it returns to the afterlife or fades away. The duration depends on the user's proficiency with the Quirk.

**Limitations and Drawbacks:**

1. **Free Will:**

- The historical figure's spirit or Stand possesses its own consciousness and free will. Depending on the figure summoned, this may lead to unexpected actions or decisions, potentially putting the user and others at risk.

2. **Emotional Resonance:**

- The user's emotions can influence the summoned entity's behavior. Strong negative emotions may lead to erratic actions from the historical figure, especially if they had a tumultuous or violent past.

3. **Knowledge Limitations:**

- The historical figure retains the knowledge they had during their lifetime. If their information is outdated or limited, it could affect their ability to adapt to the modern world.

4. **Energy Drain:**

- Summoning and maintaining the spectral entity require energy from the user. Overusing the Quirk without sufficient rest can lead to exhaustion.

5. **Potential Backlash:**

- In extreme cases, the summoned entity might resist returning to the afterlife or resent being used as a tool. This could lead to confrontations or disturbances, especially if the figure harbored negative emotions.