Much of the meaning of a poem is conveyed by the attitude it expresses toward its subject matter.
Attitude can be thought of as a combination of the poet's tone of voice, and the ideas he or she is trying to get across to the reader.
To decide on the tone you need to think about the ideas and attitudes in the poem, and then decide how you would read it aloud.
Kid could be read:
Most readers will probably feel that the tone should be mainly triumphant, showing Robin's delight that he is free of Batman at last. Yet it could also be read thoughtfully.