Spark D. Sulfur/Personality and Relationships

Personality
Sulfer has a “Unique” type of personality. When he ate the devil fruit, he can clear his mind with ease. But he was given a second personality which blocks his mind from mind readers and disturbs Sulfer when never "he" can. Thanks to this, his mind is both powerful and psychotic. But if his crew is in danger or is having some difficulties, he and Nijuu will combined their minds to be completely one. When both Sulfer’s mind becomes “one,” he can be even more dangerous than the highest bounty pirate.