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Sure, here's an example of unique content optimized for the keyword 'frisk x chara' using synonyms:
1. The protagonist and the fallen human
2. Frisk and Chara
3. The explorer with Chara
4. The courageous one x the troubled spirit
5. Frisk and the wanderer
Remember, you can create an infinite number of combinations using different synonyms and variations, but make sure to maintain readability and coherence.