The feature of speech which is not usually found in written essays is the non-verbal form of communication.
Non-verbal communication is the form of communication wherein the message is conveyed through gestures. non-verbal communication does not stop with the pause in verbal communication.
Some of the examples of non-verbal communication which are not found in written essays are eye contact, gesture, body movement, eye contact, space etc.
He faces obstacles such as the Cyclops, Scylla and Charybdis, and the Sirens.