Who were Catherine of Aragon's friends and enemy's?

Well, whether a person was a friend or enemy of Catherine of Aragon really depended on which matters/beliefs they valued over others. For instance, it was well known that Catherine did not care for Cardinal Wolsey, not only because of his influence over the king, but of his blatant corruption (he had massive wealth and a mistress and two children). Thomas More however was seen as a friend of the queen because of his (albeit somewhat overzealous) stance in his faith and his refusal to acknowledge Henry VIII's marriage to Anne Boleyn (via the Oath of Supremacy).

Other 'friends' of Catherine of Aragon:

*Ambassadors Chapuys and Mendoza (both sought the interests of the queen and even asked her to beseech her nephew, the Holy Roman Emperor to intervene on her behalf)

*Cardinal John Fisher (one of the few clergymen/learned men who refused to go along with The King's Great Matter, nor did he recognize the Oath of Supremacy

*Lady Maria Willoughby nee de Salinas (her lady in waiting for many years who came with her as a teen from Spain)

*Lady Elizabeth Darrell (another of Catherine's ladies-in-waiting who refused to take the Oath of Supremacy)

Other 'enemies of Catherine of Aragon:

*Anne Boleyn (pretty obvious one there)

*Thomas Boleyn and Thomas Howard aka the Duke of Norfolk (for pushing for the marriage between Anne and the king)