grandstander
/ˈɡrændˌstændər/
noun
- A person who behaves or speaks in a showy way to attract attention or impress others.
- At the meeting, the grandstander kept interrupting to share his own opinions loudly.
- She's not a team player; she's a grandstander who only cares about getting applause.
- The politician was known as a grandstander who always made dramatic promises he couldn't keep.