Quién eres is asking who are you. So, you would reply with who you are.
Examples:
Soy un estudiante. (I am a student.)
Soy tu amigo. (I am your friend.)
Qué eres tú means "Who are you" in Spanish
It means "Who is the girl?" Your response would be something like "Ella es Maria", or "Ella es la chica nueva".
Eres means "you are". Such as "You are American" = "Eres americano/a"
Sí, lo soy. Me gusta serlo.
Are you married or not?
"Eres" is the present tense familiar (second person) conjugation of the verb "ser", which is one of the Spanish verbs meaning "to be" in English. "Feliz" means "happy". So the phrase means "you are happy", or as a question "¿Eres feliz?", it would mean "Are you happy?"
Eres el mejor / Eres el primero
De donde eres
"How are you?" as a question. If not, then it would mean "Like you are."
It asks the question, "Are you kind?"
Probably "¿Cómo eres?" or "¿Cómo es usted?".
eres eres
Eres means "you are". Such as "You are American" = "Eres americano/a"
The question in Spanish "¿De dónde eres?" is translated as "Where are you from?". You would respond in Spanish: "Soy de ....." (city of birth or residence) Example: Soy de Asunción, Paraguay (I am from Asunción, Paraguay)
de donde eres is where are you from
Sí, lo soy. Me gusta serlo.
Are you married or not?
The question is not clear. Here are two answers. As written the answer is ¿"Eres Miguel hermano"? If you meant "are you Michael's brother", the answer is ¿"Eres hermano de Miguel"?
eres carinoso