What is Donna in the new 90210?

There's no "new 90210" with a character named Donna. The show you're likely thinking of is "Beverly Hills, 90210: The New Generation", which aired from 2008 to 2013.

In this reboot, Donna Martin is not a main character. However, Tori Spelling, who played Donna in the original "Beverly Hills, 90210," made a few guest appearances in the reboot, reprising her role as Donna.

However, "Donna" is a significant character in the original "Beverly Hills, 90210" (1990-2000). She's a beloved character known for her kind heart, fashion sense, and relationships with David Silver and Noah Hunter.