Not a product but a whole store idea; Build-A-Waifu.
You pick one of those anime waifu pillows and you get to customize it just like you would with a Build-A-Bear.
Sound boxes that say stuff like "Onii-chan!" and instead of the whole heart ceremony you do the thing they do at maid cafes where they do the heart hands and have the weeby spell to "bless" it. BOOM. Hire me.