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