Coulomb bound states

I have just been looking into Coulomb bound states, and found that the
following can bind:

negative electron and positive proton and vice-versa
negative muon and positive proton and vice-versa
negative electron and positive muon and vice-versa
negative electron and positive electron
negative pion and positive pion
negative proton and positive proton

I was just wondering if the following can form Coulomb bound states:

pion and proton
pion and lepton
pion and other mesons
tau and proton
tau and electron or muon

.