More body diversity

Even if Gale and Astarion don’t have abs, the base game of Baldur’s Gate 3 doesn’t have options to make a fat character. Mods to make both humanoid (NSFW link) and Dragonborn (NSFW link) characters heavier exist, but as the modders point out, changing the body type isn’t the end of the modding work, as alterations have to be made on clothes, as well. This is an ongoing process, but there are at least some options if you don’t want your character to look like a professional athlete.