Minor Characters
- Sergeant Soo: His name is Samuel Soo. He was friends with Alan Soh, Alvin's father. Sergeant Soo always helps Alvin in his investigations, whether he likes it or not. He became protective to Alvin and his team after he learned that Alan Soh, Alvin's father, was murdered by The Snake. He has a romantic relationship with Gracie Soh. He later becomes extremely protective to Alvin and forbids the team to be involved in any criminal investigation.(The Mystery of the Unlucky Undertaker)
- Gracie Soh: Alvin's mother. Owns a jewelry shop. She has a romantic relationship with Sergeant Soo. She is often worried about Alvin's safety during his investigation, especially after finds out how Alan Soh and Sinchita was killed.
- The Snake: Alvin's deadliest enemy. He often wears a green-reptile mask and he never takes it off. He is extremely dangerous and always tries to get rid of Alvin and his team as they always outsmart him. In The Mystery of the Rajah's Ruby, it is revealed he has a daughter, Tai.
- Tai: Her full name is Tai Pan, based on a deadly poisonous snake's name. She is very beautiful, and Alvin used to date her until Mars gave him a warning. Tai oftens go against her father's will and warns Alvin about the danger that are coming, causing her father to question her loyalty (The Mystery of the Man Who Had to Die). She was killed by a French criminal in The Mystery of the Gangster's Gun.
- Cordelia Chew: Mars' friend. She tries to get Alvin to be her boyfriend (The Mystery of the Terrified Teacher). Both Alvin and Tony are infatuated by her it seems.
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