A Hobbit, one of the FotR, lead by Meriadoc Brandybuck after the breaking of the Fellowship.
Put the liner notes together, and Pippin was "underage" - less than 33, and not considered by Hobbit reckoning to be ready for martial service. Elrond knew this when he debated sending Pippin home; Elrond knew Hobbit law and was trying to obey it.
Pippin tries to get into taverns, smokes weed, sleeps late, teases Merry about responsibilities, splashes water out of his bath-tub, serves Gondor as a page, and eventually kills a troll.
He also triggered the War of the Ring by looking into the Palantír. If Sauron had waited one more month, all his forces would have been in place (and his passes guarded); he would have won the war. [Recall that Frodo saw troops moving >into< Mordor only days before they started moving out.] But Sauron had been seeking the OneRing so long that he was incapable of not sending troops to where he thought it was.
By letting Sauron think Saruman had the Ring, Pippin wreaked the worst possible revenge on Saruman for sending troops to slay Boromir and kidnap Merry and himself.
Pippin represented in a Chaotic Good way Tolkien's ideal "acts, even mistakes, with good intent, have good consequences".
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