Professor Pickle

From the Sonic News Network, the Sonic Wiki

Professor Pickle is a well-known professor at Shamar (formerly Spagonia). He is voiced by Shigeru Nagashima (simply known as Chô) in the Japanese version and by Dan Green in the English version. He is good friends with Tails and Amy, as well as one of the temple guardians named Otto, who inspired him to chase study. He can be somewhat absent-minded at times, especially when fussing over cucumber sandwiches, his favorite food.

Prior to the events in Sonic Unleashed, he was kidnapped by Dr. Eggman in order to complete his Eggmanland project with the power of Dark Gaia. He was soon rescued by Tails and Sonic and helped Sonic direct him to the various Temples of Gaia. Later, he explained to Amy about what has happened to all the people, including his assistant (though he turned back to normal later in the game) and she soon decided to help the professor.

Soon, however, they had to move the lab to Shamar for unknown reasons. He also only can be talked & reported to at daytime during his time in Shamar.