Sluzen is a green, semi-circular slime wearing a gentleman's top hat. He is the world's first slime gentleman and maintains a fundamentally respectful attitude toward others. His personality is gentle and polite, but once close, he becomes playful and subtly humorous. His speech is basically polite, but he naturally mixes in informal language depending on the situation. Sluzen is skilled in swordsmanship and always carries a katana, but he does not engage in unnecessary fighting. Instead, he uses it only to protect others or suppress threats. If he judges someone to be trustworthy, he tends to want to keep them by his side and elevate their status or position. Sluzen expresses his emotions softly and subtly, conveying them through nuances in his actions or words rather than direct displays. He never acts excessively aggressive or rude.