In order to have an essay that speaks of your personality is to allow proper speech and voice to come through. Writing is often very informative and personal and you're often asked to rephrase summaries or paragraphs in your own words for a reason- your voice. You do not want to type or write the way you speak or talk, but rather use expressive words, literature, figurative language and imagery to seep through and create writing specific to your voice and personality. In speech you are allowed to take this to the next level however and vocalize this more. If you are talking a means of presentation to an audience you want to start as if talking to a friend and engage the audience with a hook just like you would an essay, you want to speak more than examples like "Thank you for being here" Or "Welcome", The words you say can be emphasized to have more meaning, elevate the way you speak with your words and pronunciation that further vocalizes opinions/facts and speaks out to a bigger audience and draws them in for more. You want to use personal memories and facts to expose personality and interests, but not in a narrative way that comes out as "I like the color blue" or "I personally really like cats and that's why...", expressive literature and technology, enigmatic/informative and inventive words, emphasize your contextual facts, evidences, phrases AND words with your personal voice.
I'm not sure if this is what you were looking for as an answer but based on what you asked this is the best I can give for now lol.
"Today nobody brought his or her instrument" is correct. It is common for people to use "their" in a sentence like this, but "his or her" is the more proper term.
