I would first ask the mfg for a replacement figure. If not available or not an option then here's what I suggest:
Inspect the entire figure for any other areas that may have cracks or paint lifting away from surface. You're already dealing with five locations that have paint loss, and that's a lot for one figure (not counting vintage figures or pieces saved from scrap heaps). It is likely that other areas on the figure are susceptible to developing similar issues so look closely under magnification if you can. If you find much more damage a complete strip and repaint may be in order. But if the rest of the figure looks intact and you want to give it it go it's important to remove any loose paint. So while you're mind tells you "I don't want to make the chipped areas larger", you have to lightly chip away at the edges of the chipped areas (w/ a toothpick or finger nail) to remove any loose/lifting paint. Painting over poorly adhered paint is not a good idea, so do this until the paint no longer chips off.
Next you want to carefully, lightly hit the edges of the affected areas with fine polishing paper. This will help smooth out the transition from the existing paint to the new paint. Brush away any debris with a soft bristle brush and then you're ready to move on to paint color matching and painting. Depending on the application sometimes I use a brush on primer prior to painting. I let brush on primer dry for 24 hours +. Once you have completed painting and are satisfied with the work I recommend sealing the restored areas with matte varnish if not the whole figure. I hope this helps and I wish you luck if you decide to go for it.
Joe