Oh, right, I was mixing it up with the Greater Invocation that grants you the ability to use Suggestion and convince people it was their idea.
You know, Devil's Whispers?
Honestly, I think, if you could find a suitable replacement for our friend Eldritch Blast, you could get a pretty good Fluttershy out of a high level Warlock (you just need a lot of refluffing; I'm pretty sure I can find a rabbit familiar somewhere if you aren't adverse to homebrew...)
Actually, Pathfinder has the Rabbit familiar down as giving its master a +2 to initiative as its main bonus.
Here are some nice rabbit stats.
After all, that Rabbit is going to have an intelligence of at least 6, so you've got that for Angel.