Wiktionary
a. (context idiomatic drama role-playing games English) Acting as the character, not as oneself
Usage examples of "in character".
In a way, that was a natural turn of the idea, because any idea that can cause such systematic transformation of human life has to end up being religious in character&mdash.
Kenneth tries to stay in character and he works very hard to ignore Nurse Plimsoll.
It is impossible to imagine a greater difference in character than exists between the hot-blooded Southerner, and the cold calculating Yankee of the eastern States.
I wondered if he might possibly have malaria) and he explained how the pottery changed in character, and about burials—.
In a way, that was a natural turn of the idea, because any idea that can cause such systematic transformation of human life has to end up being religious in character—.
Though there was no one around to notice, he was already in character.
He was often in character, and quite consistent in his role-playing.
Passing my hand down behind the board, I readily discovered and pressed the spring, which was, as I had supposed, identical in character with its neighbor.
They are defending a system which is ascetic in character-that is, it offers few rewards to the individual, even once it has triumphed.
No doubt several cameras were watching him now, and he was just no good at staying in character around Qiwi.
Gerswin could have taken offense and been in character, but decided against it.