How do various characters react to the relationship of Othello and Desdemona in Shakespeare's Othello?

Iago, who is the villain of this tragedy by Shakespeare,
and several other characters are jealous of the relationship between Othello and
Desdemona, including Roderigo.  Roderigo (and probably Iago, on some level) wants
Desdemona for himself, so naturally, he is jealous.  Iago is jealous of Othello, too,
because he is a skilled general and is much more talented and strong than he is.  Iago
has little love or respect for his wife, Emilia, who is Desdemona's lady-in-waiting.  He
treats her cruelly and with disdain, so he is probably jealous of the true love Othello
and Desdemona share.

Other characters, including
Desdemona's father, disapprove of their relationship because of how quickly they married
and because they did it in secret.  Also, some are upset because Othello is a Moor,
which is a different race than Desdemona.

Others try to be
supportive of their relationship, including Cassio and Emilia.  They, however, get
sucked into Iago's evil plan to make Othello kill Desdemona, which ultimately succeeds. 
All of the characters are touched in some way by this tragedy.