Shadowheart: Chubby, maybe more pear shaped, a lil more muscle
Lae'zel: Thin, almost no bodyfat, alien sharpness/proportions like longers limbs, broad shoulders little waist, etc, she's a trained warrior from birth
Karlach: Muscle and fat, spent the last 10 years fighting in hell, but i figured she may be well kept like gets enough food etc. she's big, beefy
Gale: A wizard... who spends his days reading books and eating delicious food, he's a lil chubby
Astarion: gaunt, unhealthy, has been eating rats for 200 years
Wyll: a literal adventurer, has been adventuring proffessionally for a while, so he's be muscular, athletic, etc, if he's a dex build i imagine he has muscles that are 'just for show' haha
Halsin: a bear... just make him big...