Agatha Christie's Hercule Poirot.
Elizabeth Peters' Amelia Peabody.
Hazel Holt's Sheila Malory (I have only read four books in her cosy mystery series, but have enjoyed them a lot).
Derek Landy's Skulduggery Pleasant (YA contemporary fantasy).
P. D. James' Adam Dalgliesh.
There are plenty more I've enjoyed, but that would be a pretty long list...
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