Sure, here's an example of unique content optimized for the keyword 'frisk x chara' using synonyms:
1. The main character and Chara
2.
Frisk with the lost soul
3. The adventurer with Chara
4. The courageous one and the troubled spirit
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.