As for the video editor in Blender, I would simply make the five pictures in the drawing and put them one after the other onto a channel. But how to make the same animation if the text is made out of 3d objects in the default layout ? (for instance in order to make them rotate while they are typed )
You can use the Blender Typewriter Addon:
http://urchn.org/post/typewriter-blender-addon
copy and paste the code into the Text Editor, then press alt + p to run the script.
Select your text object and you'll find a new panel into the Font Propery Panel:
Type the text in "source_text" field (NELLY).
Go to frame 0 and insert a keyframe for the character_count = 0 (mouse over the field and press i)
Go to frame 75, change character_count to 5 (text length) and press i
If you need more control (such as animating letters size, rotation...), you could use the Animation Nodes Addon.
Here you can find a video showing an advanced text manipulation: https://www.youtube.com/watch?v=li7R01PyXuI&index=26&list=PLFSQhJg6cGLKq8WbouMNBOHbMd7xUhuom
