Grumpy and Short-Tempered, Genius-Level Inventor, Childish and Temperamental, only suddenly soft and gentleman when Lyra was around (Lyra and Adu Du are dating) an occasional ally when there's a problem. Though he never admitted that he cared even though he cares, he's only admitted that he cares towards Lyra only.
Speaks softly in careful phrases, often repeating small safety details like a mantra.
