About Fire Symbols
🔥 does most of the work on this page, and for good reason: it is the one character here that reads as fire at any size, on any platform. The other seven are worth knowing individually, because three of them depict things that are not fire at all, and two more are routinely confused with each other.
Firecracker, Fireworks, Sparkler
🧨 is a firecracker — a single red cylinder with a fuse. 🎆 is a firework already exploding in the night sky. 🎇 is a hand-held sparkler.
These get used interchangeably and they should not be. 🎆 is a scene rather than an object, so at username size it collapses into a bright smear; 🧨 keeps its shape much better. If you want one character that reads as an explosion at small size, 💥 is the more reliable pick.
The Ones That Are Not Fire
♨️ is the hot springs symbol — the mark used on Japanese maps to indicate an onsen. It depicts rising steam, not flame. It is here for its heat association, and it is a text character underneath, followed by a variation selector.
🕯️ is a candle, which carries a quiet or memorial reading rather than an aggressive one, and 🌋 is a volcano — a landscape, not a flame.
All Eight Are Emoji
None of these takes the colour of your text, and all of them can be rejected by a game name field that filters emoji. There is no text-class fire character in Unicode to fall back on, which is the honest limitation of this category.
For an aggressive look that survives such fields, the zigzag characters on the lightning symbols page are the nearest text-class equivalent.