Disclaimer: Neither of us own any of these characters. Not yet, anyway (bwahahahahahahaha...)
We only own the ideas.

Valjean-

~Give him a Javert action figure.

~Kidnap Cosette.

~Make out with Cosette right in front of him.

~Remind him that it is his fault Javert fell off the bridge.

~Pretend to be the ghost of Javert and haunt him.

~Sing "Who Am I"relentlessly.

~Tell him it's not healthy for him to change his name every five years.

~Sign him up for therapy for his identity crisis.

~When he insists he doesn't have an identity crisis, sing "Who Am I" again.

~Remind Valjean that no matter how nice he is now he still stole some poor bishop's silver way back when…

~Stick a bumper sticker on his car that says "I Pushed Javert"