Aww, you guys who think Michizou is too beta for anyone just need to give him some time. I was pathetically beta myself at 15-16, but I've leveled up over the years to become only somewhat beta.
I say Michizou and Tamako should wait for each other and remain chaste for the next several years. Give Michizou some time to grow a spine, and Tamako some time to grow boobs. Then they can get together as a couple truly worthy of each other's love.