Theo and Thompson often look to Diego for new activities particularly those that might cause a little ire from the one who pays the bills.
One thing I dearly wish Diego would teach the other two is how to relax. Theo and Thompson both are much more high strung and jumpy. Diego-san emphasizes his species' infamous "cool" personality trait. He sometimes gets unruly and riled up (especially when Theo is chasing him all over the place) but he more often is calm, cool and collected.