“Games give you a chance to excel, and if you're playing in good company you don't even mind if you lose because you had the enjoyment of the company during the course of the game.” ― Gary Gygax
Most mis-shapen soft plastic miniatures can be fixed by:
1. drop miniature into a mug of boiling water (from a kettle)
2. remove after 20 seconds using a suitable implement (spoon, tongs etc.)
3. reshape the plastic
4. drop miniature into mug of cold water (from the cold tap or fridge)
5. Use water from (1) to make a nice cup of tea
You may need to repeat step (1) to (4) if it's not fixed on first attempt
edited for safety reasons
I second this method.
Depending on the thickness of the plastic, hot water from the tap may be sufficient.
I also find it helps to hold the mini in the desired position with both hands while putting the mini into the cold water, so I prefer running cold tap water for step 4, or a mixing bowl with ice and water.
This method also works if you want to make some subtle changes to the pose of a model to give your model its own flair.