The speaker of this tiny poem is accompanied by a double and cannot say who he himself is. That imbalance is the central idea. The "I" stays blank ("whoever I am"), while the companion arrives with a red beard and a bright smile. The double is the vivid one, and the self is the shadow. Doubles in folklore and Gothic fiction are often sinister, but this one is hairy, warm and almost festive. The poem takes an uncanny idea and makes it oddly companionable.
The title does some quiet work. "Doppelgänger" is German for something like "double-goer," and the first line picks up the second half of the word: "who goes with me." The phrase also sounds like the old sentry's challenge "Who goes there?", so it hovers between a question and a statement. There is no punctuation to settle it. Is the speaker asking who this companion is, or simply naming him? The next line, "whoever I am," makes things stranger. It can mean "he goes with me no matter who I turn out to be," or it can admit that the speaker doesn't know. Either way, "who" at the start and "whoever" at the end bracket the couplet with uncertainty.
The grammar of the middle stanza keeps blurring the two figures. "Born with a beard" follows straight on from the opening, so it could describe the double, or the "I" himself. The poem never says which, and that may be the point: a double should be hard to tell apart from the original. The beard becomes "a red bush," which makes hair into something wild and unpruned, like a plant. Because fire appears two lines later, I read a faint echo of a burning bush here, though that is my inference rather than something the poem states. Then comes the strangest comparison: the beard is "thick as gossip." Gossip is not thick in any physical sense, but it does tangle, spread and grow in the telling. So the beard seems to be made of what people say. Judging by this image, the double may be the self that others see and talk about, the public version, while the private "I" remains unknown even to itself.
The last stanza gives the double a "smile / like fire on Christmas." The fire is a hearth fire, the warmth of a crowded room, and the missing article ("fire on Christmas," not "the fire at Christmas") makes the line sound like a remembered occasion. Fire is also red, which links the smile back to the bush, and fire can burn as well as comfort. The poem doesn't say which kind of smile this is, and that keeps a little menace under the cheer. Notice too that both descriptions are similes: "like a red bush," "like fire on Christmas." The double is built entirely from comparisons, while the speaker has no description at all. It is a portrait made of resemblances, which suits a poem about a lookalike.
The form is spare and carefully balanced. There are three stanzas of two, three and two lines, with the beard in the middle like a face between two hands. There is no rhyme, no punctuation and no capital letter except the "I," so the poem sounds like something murmured rather than declared. Most lines run to four syllables: "who goes with me," "born with a beard," "like a red bush," "thick as gossip." That steady short measure feels like footsteps, appropriate for a companion who goes along. Sound reinforces the image. The b's in "born," "beard" and "bush" make the hair feel dense, and "red bush" lands as two heavy beats together. The shortest line, "and a smile," acts as a pause, and the final line stretches out to let the fire spread, ending on the soft, glowing word "Christmas."
The poem's significance lies in how much it leaves open with so little. It doesn't explain the double or decide whether he is a friend, a rumor or a reflection. By describing the companion in such detail and the speaker in none, it suggests that we may know ourselves mostly through the figures that follow us around: our reputations, our faces, the warmth or heat we give off. The poem asks who goes with us, and it quietly admits that this may be easier to answer than who we are.