It's Independence Day here in the United States, so it's an apropos day to discuss Fireworks Man aka Human Fireworks.
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I'd make Fireworks Man another of Diana's mad scientist foes, possibly a professor of research at Holliday University, who has a horrible lab accident due to battle between Diana and a superfoe on the university's campus.
He'd have a human form (Jubilee-like) to a plasma energy form. In human form he can create and lob and shoot fireworks of bright, colorful destructive and explosive energy. In plasma energy form, he has the ability to fly and emit larger, brighter and more colorful, and more powerful explosive energy.
The more he utilizes his powers, the more weary he becomes, reverting back to his human form eventually and needing time to naturally "re-energize" his powers from within himself.
He's immune to and can survive explosive energy - at least those that are based on heat and light. Transforming into his plasma form will heal any wounds he received in his human form.
His best friends are Mouse Man and Paper Man.