It's interesting to note that the word is actually borrowed directly from English. However, it's very much integrated into the German language and used frequently.
Other, less common, options might include:
* "Schnösel" (a bit more informal and playful)
* "Wichtigtuer" (literally "important-doer," implying someone who acts overly important)
* "Geltungssüchtiger" (someone who is eager for attention and recognition)
The best choice will depend on the context and the specific nuance you want to convey.