Can't imagine force users or military type to be obese...sorry...i think they are really created for NPCs...
Female body type 4 isn't obese but the male one definitely is.
Anyway, I've only played 4 classes for any length of time so far. I think they fit the class and voice actors pretty well:
Female SW - Marauder
- Body type 2 Cyborg.
Female JC - Shadow
- Body type 1 Human.
Male IA - Sniper
- Body type 2 Ratattaki.
Male Trooper Vanguard
- Body type 2 Zabrak.
As you might be able to tell, I typically only use male body types 1 & 2 and female body types 1, 2 and 4. Body type 3 just looks ridiculously tall to me, even on males, and male body type 4 is too fat.