The obese Peter Höllerer is a constant source of comic relief in the series. Generally found ensconced behind his desk working the phones, his face visibly falls whenever Moster and Stockinger (or, later, Brandtner and Böck) require him to do fieldwork. That said, he is capable of surprising speed when running and can also demonstrate driving skills on a par with other officers.
Höllerer tends to take a co-ordinating role when an operation is being planned, rather than actually going undercover or making the arrest himself. In these situations, he reveals himself to have a very clear head and to be capable of coping with even the most unusual situations that his partners get involved into.
Höllerer has a soft spot for Rex as the series progresses, after first voicing concern that Moser did not adopt him through the proper channels. This is shown by his keeping score between Böck and Rex in the early episodes featuring the former. Höllerer takes inordinate delight in seeing the dog outsmarting the man.
Höllerer's departure from the series is brought about by his retirement to care for his ailing mother, a woman about whom he often speaks. He is replaced by Fritz Kunz.
Of all the recurring characters in the series, Höllerer's accent is the thickest. Viewers familiar with standard German will often have difficulty understanding his Viennese dialect.