What similarities are there between Adam and Celia in as you like it

Both characters are side kicks or loyal friends to their other. So, for example, Adam is a loyal servant to Orlando. He even travels with him into the forest of Arden which is not an easy thing for an old man to do. Like Adam Celia follows someone else into the forest. Although not a servant she is still loyal to her cousin Rosalind. She is a sort of foil to Rosalind yet, like Adam, her fidelity to Rosalind is never in question.