"He" is perfectly fine. If you have a male character, you should refer to him by his name, by his title, or just by "he" - writers who constantly come up with flowery descriptions end up distracting the readers instead of letting them get into the story.
instructed, advised, informed
beyond plus In addition
said, remarked, agreed, announced, whispered, shouted, yelled
When you use 'her' instead of 'girl', you are using a pronoun.
Don't worry so much about finding odd synonyms. Just write -- the reader will skip over most of the "the" "an" and "a" words.
You can use words like "realized," "wondered," "pondered," or "considered" to convey thoughts within dialogue. These alternatives can help make the character's thoughts clear without needing to explicitly state that they are thinking.
Instead of saying "That is Tommy's candy," you could say, "That is his candy."
I need help writing this essay.
I is a First Person Pronoun. If you say I we don't know who "I" is and We will not be able to answer the question then
Begin by using real words like "writing," instead of jargon like "the writing process."
"I" would be the best word if your character is talking about himself/herself. It just sounds funny to say things like "The person talking believes that ...." Just say "I believe that..." or "I was a youngster when that happened" or whatever.
When writing dialogue, remember to make it sound natural by paying attention to how real people speak. Keep it concise and to the point, using dialogue tags and actions to break up the conversation. Lastly, ensure each character has a distinct voice and that the dialogue moves the story forward or reveals something about the characters.