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