The Espada (十刃, (エスパーダ), Esupāda; Spanish for "sword", Japanese for "ten blades") are the top-ranked Arrancar in Aizen's recently-acquired army of hollow-shinigami hybrids, the most...
according to the number 1 is the strongest. 4 does have the second form but i still think Stark ( the 1st espada ) is stronger. we just don't get to see his full power wrong ulquiorra is stonger...
If you mean the people, they show up anywhere. Hueco Mundo, The world of the Living, sometimes even the soul society. It makes a whistling noise.
If you mean the episodes when they first show up...
Well, they obviously can drink tea, so i don't see why not. yes of cource they do they eat other hollow to reach espada form and they will probably continue eating to increase their power more, both...