Harriet Glickman, who in 1968 persuaded Charles M. Schulz, the creator of “Peanuts,” to add an African-American character to his roster of Charlie Brown, Snoopy and the rest of the gang, died March 27 at her home in Sherman Oaks, CA. She was 93.

She wrote to several cartoonists, including Mr. Schulz, urging them to add black characters to their strips. Following correspondence between the two, Mr. Schulz advised Ms. Glickman that she should look out for a strip to be published toward the end of July. On July 31, 1968, Franklin Armstrong appeared in “Peanuts” for the first time. Nothing aside from the color of his skin set him apart from the other children in the strip.