Asparagus
Leeks

tomatoes and potatoes are almost identical from a companion planting stand point, you can actually graft the two plants together and get both crops off one plant (with drastically reduced efficiency) so you can't really get away with planting them on top of each other any more than you could planting a potato on top of a potato.

All the brassicas can be planted deeply or be hilled. Peas and viney squash will root along buried stems. The general rule of thumb is annual plants have growth points toward the end of growth can often tolerate burial. Those with growth points at or near the surface, such as rosette-formed plants cannot be buried: beets, carrots, strawberries, lettuce

With potatoes, you should bury stems because tubers are set above the original tuber along new stems. I would never plant in succession plants of the same plant family sharing the same pests and diseases.

I plant eggplants deep, the same way as tomatoes.