Question: Who designed the successor to the Mercedes-Benz W25?

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Mercedes-Benz SLS AMG: The Mercedes-Benz SLS AMG (C197 / R197) is a front mid-engine, 2-seater luxury, limited production supercar automobile developed by Mercedes-AMG of German automaker Mercedes-Benz and was the first Mercedes-Benz automobile designed in-house by AMG.  The car, which has gull-wing doors, was the successor to the Mercedes-Benz SLR McLaren and was described by Mercedes-Benz as a spiritual successor to the Mercedes-Benz 300SL Gullwing.  SLS stands for "Sport Leicht Super" (Sport Light Super).  The Mercedes-Benz SLS AMG was assembled largely by hand, with its chassis and aluminum body shell produced by Magna Steyr in Graz, Austria and then transferred to Sindelfingen, Germany for assembly, with its engine being hand built by AMG in Affalterbach, Germany.

Mercedes-Benz W143: The Mercedes-Benz Typ 230 n was introduced by Mercedes-Benz in 1937 as a successor to the .  It was one of several models over the space of nearly eight decades to be sold with a name along the lines "Mercedes-Benz 230", and is therefore in retrospect more normally named according to its internal works designation as the Mercedes-Benz W 143

Mercedes-AMG C-Coupé DTM: The Mercedes-Benz AMG C-Coupé DTM is a third generation touring car (DTM) constructed by the German car manufacturer Mercedes-Benz.  It is the successor to the Mercedes-Benz C-Klasse which was permanently retired after the 2011 season.  The AMG C-Coupé DTM is based on the Mercedes-Benz C-Coupé.  Mercedes-Benz chose the IAA International Motor Show in Frankfurt to present the new 2012 DTM AMG Mercedes C-Coupé.  The new car is the successor to the AMG Mercedes C-Class, which scored 84 victories in 156 races to become the most successful vehicle in the 27-year history of the DTM.

Mercedes-Benz W142: The Mercedes-Benz W 142 (Mercedes-Berz Typ 320) was a six-cylinder passenger car launched in February 1937, as a successor to the Mercedes-Benz Typ 290 (Mercedes-Benz W 18).  The car was known by its name"Typ 320" at the time of its production and service, but is in retrospect commonly referred to using its Mercedes-Benz works number, "W142" which gives a more unambiguously unique nomenclature.

Mercedes-Benz W126: The Mercedes-Benz W126 is a series of S-Class automobiles manufactured by Mercedes-Benz between 1979 and 1992.  Premiering in September 1979 as the successor to the W116 line, the W126 was the second generation to officially bear that prestigious designation, an abbreviation for the German "Sonderklasse" or "special class."  It introduced many Mercedes-Benz safety innovations, including the first seatbelt pretensioners.

Mercedes-Benz W25: The Mercedes-Benz W25 was a Grand Prix racing car designed by Daimler-Benz AG for the 1934 Grand Prix season, in which new rules were introduced, and no championship was held.  In 1935, the European Championship was resumed, and it was won by Rudolf Caracciola in a W25.  In modified form, the W25 remained in use until 1937, when it was succeeded by the Mercedes-Benz W125.

Mercedes-Benz AMG C-Class DTM (W203): The Mercedes-Benz AMG C-Class W203 DTM is a Touring car (DTM) constructed by the German car manufacturer Mercedes-Benz.  It was the successor to the Mercedes-Benz CLK DTM who permanently retired after 2003 season and based as Mercedes-Benz C-Class W203 first generation car.  Mercedes-Benz AMG C-Class W203 DTM makes first roll-out on February 3, 2004 in the Circuit de Catalunya.

Mercedes-Benz S-Class (W221): The Mercedes-Benz W221 is a chassis code of S-Class, the successor of the Mercedes-Benz S-Class (W220) and the predecessor of the Mercedes-Benz S-Class (W222).  The S-Class are the flagship vehicles of Mercedes-Benz and each generation typically introduces a range of technical innovations and developments that over time will find their way into smaller cars.

Mercedes-Benz S-Class (W222): The Mercedes-Benz W222 is the version of the Mercedes-Benz S-Class produced since 2013, and the successor of the Mercedes-Benz W221.  The W222 was designed during 2009.  The original design proposal of the car was created by Il-hun Yoon, a Korean designer, who was inspired by the Mercedes-Benz F700 concept car.  The exterior design was developed by a team of designers under the direction of Robert Lešnik.  W222 has a similar design theme to the CLA-Class and Pre-Facelifted E-Class (W212).

Mercedes-Benz W125: The Mercedes-Benz W125 was a Grand Prix racing car designed by Rudolf Uhlenhaut to race during the 1937 Grand Prix season.  The car was used by Rudolf Caracciola to win the 1937 European Championship and W125 drivers also finished in the second, third and fourth positions in the championship.

Supporting paragraphs: Mercedes-Benz W25 Mercedes-Benz W125
Answer: Rudolf Uhlenhaut