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