As of July 21, here are the candidates who have announced their campaign for her seat.
Alejandra Salinas

“Houston is a strong and resilient city with hard-working families and individuals,” Salinas said in the news release. “I am fighting for what my neighbors want and every Houstonian deserves—safer neighborhoods, affordable and reliable city services and a strong infrastructure that keeps the lights on and keeps floodwaters out of our homes and cars.”
Salinas has been endorsed by Houston council members Sallie Alcorn and Joaquin Martinez, as well as Harris County Commissioner Adrian Garcia, Harris County District Attorney Sean Teare and U.S. Rep. Sylvia Garcia, according to her campaign’s website.
Dwight Boykins

Boykins has been endorsed by former U.S. Representative Beto O'Rourke, according to a July 14 Facebook post.
Obes Nwabara

Nwabara’s campaign surrounds providing residents more access to reliable public transportation, cleaner drinking water and economic opportunities to build a secure future.
He has been endorsed by State Board of Education Member Staci Childs and Harris County Democratic Precinct Chairs David Galbin, Michelle Palmer and Rosalind Caesar, according to his campaign’s website.
Al Lloyd

Lloyd’s campaign focuses on enhancing public safety, “building a safer, smarter and more equitable Houston” and making city services more accessible.
Jordan Thomas

Jordan Thomas, Plummer's former Chief of Staff and currently a project manager at HVDC Transmission Development, announced he is running for Plummer's seat, according to an Aug. 6 social media post.
"I’m running for City Council At-Large 4 because when I read the news, listen to the radio, or doom-scroll on my phone, the message I get from City Hall is that Houston is broke and no longer capable of achieving great things, no longer capable of summoning our legendary entrepreneurial spirit, and no longer interested in inspiring the next generation of Houstonians," Thomas wrote in an open letter on his campaign's website. "I reject this message. Houston is mine, it is yours, it is ours. We cannot cede its future to people who do not believe in it with the same strength of our own convictions."
Thomas' campaign focuses on improving the city's infrastructure, making it more walkable, boosting transit-oriented development and fixing the "broken" Tax Increment Reinvestment Zones system. He also plans on focusing on affordable housing and re-committing the city to Vision Zero, a multi-national road traffic safety project aimed at eliminating traffic fatalities and serious injuries.
Something to know
An At-Large council member is someone who represents and works on issues surrounding the entire city. Whereas district council members represent a specific area in the city, such as council member Abbie Kamin who represents District C, which encompasses neighborhoods like the Heights and Montrose.
An official date for the election has not been announced yet, but many candidates expect the election to be held on Nov. 4. Plummer will hold her seat until a new candidate is elected.