Below you can see the new cheat codes introduced in The Forgotten expansion.

i don't exist

This cheat code will summon a killer penguin near your TC which you can use to destroy your enemies.

Video by nialinius (source)

ninjaconnor

This cheat will give you +100000 to each of the resources, which is 10 times more than every resource cheat by itself (400 times more than the original AoC).

ninjalui

Does exactly the same as ninjaconnor: 100000 to all resources.
Probably an easter egg from Skybox who are all ninjas.

Does the same as ninjaconnor and ninjalui.

New cheat code introduced in 3.6: this will summon Alfred the Alpaca which has 120 attack and shouts various phrases as seen in twitch streams. Seems to be more powerful than Furious the Monkey Boy (who had an attack of 99), and can also be sent in groups.