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