Start with a broad, information-rich character
Choose someone whose gender, crew or organization, Devil Fruit type, Haki, bounty, height, and debut arc are well documented. A varied profile creates useful contrasts. After the first row, eliminate characters that conflict with every green or red clue before considering another guess.
Treat yellow as overlapping evidence
A yellow cell is not a near miss; it means the guess and target share part of a multi-value attribute. For affiliation or Haki, list the exact overlap and ask which remaining characters could share it while still satisfying the other columns. Combine clues instead of solving each column alone.
Bracket bounty, height, and debut
Use the arrows as upper and lower bounds. If one guess says the target is taller and a later guess says shorter, the answer lies between them. Apply the same interval method to bounty and debut order, then use categorical clues to choose the best candidate inside that range.