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Waifuism seems to be mainly determined by objective feminine traits: Wide hips, thick thighs, and soft facial features (See Vaporeon, Braixen, Goodra, Lopunny, Leavanny, and Lilligant), although subjective features like eye shape, body type, and "personality" also play a predominant, if not deciding, role in whether the mon can be waifu'd (See Gardevoir, Blaziken, Mawile, Heliosk, Bayleef, and Salandit.)