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If you're into JoJo, lot of the Super Action Statue figures can sit if they don't have a coat or skirt restricting it, pic related. The SHF Lupin III figures are also good for sitting, as are the Revoltechs of the same characters (the Revos even come with chairs). The D-Arts Elizabeth from Persona 3 also comes with her own chair accessory and a swappable bottom half because her dress is restrictive. If you like Metroid, Figma Samus is another figure that can sit pretty well.