I really liked Oswald Cobblepot (Robin Lord Taylor portrayal of Penguin was brilliant), and Edward Nygma (Cory Michael Smith, was likewise brilliant as Riddler, and I absolutely loved his suit! Tasteful, even with the latter addition of the question marks). And of course I have adored Sean Pertwee (as Alfred Pennyworth, whom I am sure Batman was influenced by the voice....gravely 'I'm Batman'), since seeing him in 'Dog Soldiers' and 'Event Horizon'.
Gotham was an underrated series imho.
That's all. For now.