Also, in practice, no, you cannot make a political party in Greece. There's a country-wide threshold of 3% that you need to exceed to get into the parliament. A lot of well-organized parties struggle (and often fail) to exceed it. So even if you get 100% in an electoral district, you won't get its respective parliament seats. In fact (IIRC the tidbits of the election law), you will be making the first party stronger (and I don't mean by depriving votes from the second party).
This is not unlike other Western democracies. But this is essentially a design to cull any grassroot movements. Not very democratic.
