Deuteragonist

Protagonist < Gk πρωταγωνιστης < πρωτος (prōtos) 'first' + αγωνιστης (āgōnistēs) 'actor'; deuteragonist < Gk δευτεραγωνιστης < δευτερος (deuteros) 'second'; tritagonist < Gk τριταγωνιστης < τριτος (tritos) 'third'. It is interesting that besides πρωτος (prōtos) 'first', there is a πρωτερος (prōteros) 'before, in front, earlier' , where the -eros suffix seems to be the same as that of the comparative. For the prV cf. L prae, pro, prīmus 'first', but also prīmārius (< *pris-mo-s), English has first with -st of the superlative (and German has erst with the first part being related to English ere, early + -st, zweite is a neologism from Luther replacing the earlier ander 'other' in OE ōšer 'second, other (of two)', cf. former and latter). (There are no *deutos or *triteros.) Where Latin has secundus ('following', cf. sequor), Greek has deuteros. English has first and third, but borrowed second from Latin via French, replacing other as above.

Ceci n'est pas un seing.