Mr. Howard

Mr. Howard is a teacher at Ridgeway high school. He is the typical grouchy old man who hates children. He first appeared as the detention math teacher in iGot Detention. Mr. Howard likes to watch The Geometry Channel in the teacher's lounge. He seems to despise Principal Franklin, calling him a "weak fool." Though married, he seems to have an affair with Ms. Briggs (according to Sam but who knows!). He was a co-principal when Principal Franklin was fired. Mr. Howard seems to hate the iCarly trio, especially Freddie. He taunts him in "iHave My Principals" and he says that no one cares what he thinks in "iTwins." His wife thinks he's a loser according to iHave a Principals.

Spouse
Mrs. Howard

In two episodes where he plays a big role, his wife is mentioned. It's revealed that he has a bad marriage since he and his wife hate each other. And due to the fact that he cheated/ is cheating on his wife with Ms. Briggs.

Mr. Howard said that he hates laughter. Sam replied, "I thought you hated your wife!". Mr. Howard answered, "Her too!"
 * iGot Detention:

When Mr. Howard was just about to get fired from being co-principal of Ridgeway High School, he pleaded to Superintendent Goreman, "Please! My wife finally thinks I'm not a loser!". Goreman said, "Well, you are!".
 * iHave My Principals:

Things that Mr. Howard doesn't like
Laughter

Children

Mrs. Howard/his wife

Principal Franklin

Things that Mr. Howard likes
The only thing Mr. Howard likes is the Geometry Channel.

And making out with Mrs. Briggs ( not his wife) in the teachers lounge.