THE PERSONAL Pronoun - Subject Form Homepage
As Subject   French Italian Portuguese Romanian Spanish Translation
Singular      
1st Person Je Io Eu Eu Yo I
2nd Person Tu/Vous Tu/Lei Tu/Você Tu/Dumneavoastră Tú/Usted You/ Formal you
Masculine 3rd Person Il Lui Ele El Él He
Feminine 3rd Person Elle Lei Ela Ea Ella She
On     One/We
Plural      
Masculine 1st Person Nous Noi Nós Noi Nosotros We
Feminine 1st Person Nous Noi Nós Noi Nosotras We
Masculine 2nd Person Vous Voi/Loro Vós/Vocês Voi/Dumneavoastre Vosotros/Ustedes You/ Formal you
Feminine 2nd Person Vous Voi/Loro Vós/Vocês Voi/Dumneavoastre Vosotras/Ustedes You/ Formal you
Masculine 3rd Person Ils Loro Eles Ei Ellos They
Feminine
3rd Person Elles Loro Elas Ele Ellas They
How to Avoid Confusions?
Except in French and Romanian, where vous and dumneavoastră (the polite form of 'you') require a verb at the second person
plural in Italian, Portuguese, and Spanish, the polite 'you' requires a verb at the third person (singular/plural).
Examples: Voulez-vous, Charles, une tasse de lait? Quiere Usted, Carlos, una taza de leche? (French/Spanish: Do you, Charles, want a cup of milk?) Analogically, when used as a direct and indirect object, the formal 'you' is replaced by the 3rd person form, except in French and Romanian, where vous, and respectively, dumneavoastră are used.
Except in French, the subject pronouns are omitted: Vengo mañana. (Spanish: I come tomorrow.)   
They are normally used with the purpose of emphasis. Yo tengo frio. (Spanish: I, for my part, am cold.)
In Spanish, we and you have both a feminine and masculine form (e.g., nosotros-nosotras).  
On -- Particularity of the French Language  
On is generally used to represent people in general (On aime toujours le premier jour de printemps./ One always loves the first day of Spring.) and to express we in an indirect way (On mange?/Will we eat?).
In Brazil, você(s) is used all the time. Tu and vos are used only in European Portuguese.