Joining the Detroit Tigers in 1903, Bill Donovan was a solid Pitcher who in 1907 helped the Tigers to the Pennant when he posted (what is still) a franchise best winning percentage with a 25 and 4 record.  He was a big part of them winning the next two Pennants and would overall have a record of 140 and 96.  Donovan was also an above average hitter for a Pitcher and batted .207 for Detroit.

Known for his patented curveball (which was why they called him “Hooks”), George “Hooks” Dauss was a career Detroit Tiger (1912-26) who won over 200 Games for the franchise and would reach 20 Wins in a season on three occasions.  Dauss still holds the Detroit Tigers record for Wins with 223, and he would have 1,201 Strikeouts.

Hall of Fame Pitcher Jim Bunning spent less time with the Philadelphia Phillies than he did with Detroit, but it was with the former where he would be more recognized.  Still, it was with the Tigers where he accomplished more accumulatively and went to five All-Star Games.  As a Tiger, Bunning was a two-time league leader in Strikeouts and would lead the AL once in Wins and FIP.  

Overall, as a Tiger, Bunning had a record of 118-87 with 1,406 Strikeouts.  He would be inducted into the Baseball Hall of Fame in 1996, albeit wearing a Phillies cap.

While George Mullin was not exactly known for his control (he led the AL in Walks four times) he was a workhorse of a power pitcher, exceeding 20 wins in a season six times, including the 1909 season where he led the American League in that category.  Mullin still holds the franchise record for Innings Pitched both all-time and in a single season.

Helping the Tigers win three Pennants (1907-09), Mullin and Detroit may not have won any of those World Series, but he went 3-3 overall with an ERA of 1.86, showing that he certainly did his part.  He was also an excellent batter and was one of the best Detroit ever had.  He batted .261 with 372 Hits for the Tigers.  Overall, he went 209-179 with 1,380 Strikeouts.