Use the Type On behavior

The Type On behavior creates a “type-on” or typewriter effect, with text appearing character by character.

Apply the Type On behavior

Apply the Type On behavior (from the Text Animation behavior category) to text in your project.
For more information, see Apply a text behavior.
When you play the project, the text pops on character by character. To create a softer fade-in effect, select the Fade In checkbox in the Behaviors Inspector or HUD.
The Type On behavior is applied over the duration of the text object.

In the Layers list or Timeline, select an applied Type On behavior.
The Type On behavior bar is selected in the mini-Timeline and Timeline.
Do one of the following:
- In the Timeline or mini-Timeline, trim Type On behavior by dragging the right end of its bar toward the left, to the frame where you want the animation to end. As you drag, a tooltip displays the duration and delta (amount of change) of the behavior.
- Drag the playhead to the frame where you want to set the new Out point, then choose Mark > Mark Out (or press O).
  By the time the playhead reaches the end of the new behavior duration bar, the type-on effect is complete.
Note: You can also slow the type-on effect by extending the behavior bar in the Timeline beyond the duration of the text object.