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Jackie Twu (Often misspelt as Jackie Two, or Jackie 2), is the unloved son of Jackie Chu. He first appears in The Fly Problem!. He's 3 years old and he has 2 PHD's in Calculus. He makes iPads with his siblings for Mainland China. Jackie Twu was voiced by Chilly in The Fly Problem! Then he was later voiced by Chris in later episodes.
- Unlike Jackie Chu, Jackie Twu does not have slant eyes Because according to Jackie Chu, he doesn't go into puberty until he's 13 years old.
- He has no time for friends. Just work.
- Jackie Twu is the 2nd most intelligent character in SML since he is only 3 and has 2 PhDs in Calculus. He is listed as the 2nd most intelligent character in the List of character attribute rankings.