The phrase "aggressive character" is correct and can be used in written English.
For example, you could use it in a sentence such as, "The villain's aggressive character was clear from the moment he appeared on the scene."
"No work without an aggressive character can be a masterpiece".
There is no masterpiece that has not an aggressive character.
"David is an aggressive character and we support that," he said.
"He's a really vicious and aggressive character in Street Fighter 1.
One particularly aggressive character, Robert, who angrily (and unprintably) tells "all you Americans" to leave New York, made audiences in Berkeley, Minneapolis and Washington squirm in their seats.
This time around, the anxious, aggressive character played by Mr. Allen is C. W. Briggs, an investigator at a Manhattan insurance company.
She said there were "a few aggressive characters" among the police officers.
In books, movies and TV shows, tiny women are shattering stereotypes and appearing as aggressive characters spoiling for a fight.
Rewarding bullish, even aggressive characters because they can make a lot of noise and sound as if they know what they are talking about is not really good for science, but too often it can happen.
Upgrading some skills provides additional dialog options; attractive and charismatic characters seduce to get their way, aggressive characters threaten and others persuade their targets to cooperate.
The non-SP cells induced by macrophage-like cells showed more aggressive characters, which increased cell migration compared with the control cells and showed some fraction of SP phenotype.
