Two of the best characters from Gotham have to be Oswald Cobblepot (Robin Lord Taylor) and Edward Nygma (Cory Michael Smith). The relationship between the Penguin and the Riddler has been growing as the seasons progressed, starting with an awkward meeting in the GCPD squad room to them becoming best friends. When I spoke with the two actors over the summer, both said the relationship between the two characters would be important in the new season and that is paining out. Here they are talking about it now as we are a few episodes in.
For a while now I've found these two characters more likable than Jim Gordon.
Gotham airs Mondays at 8 PM on Fox.