Sure, here's an example of unique content optimized for the keyword 'frisk x chara' using synonyms:
1. Frisk x
the fallen human
2. Frisk with Chara
3. The explorer and the wanderer
4. Frisk 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.