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- Gaster!Sans may be the first and only one to appear on both AUs.
- In Echotale Echo!frisk and Gaster!sans are a couple.
- Gaster!Sans tends to be seductive, and likes to toy with Echo!frisk, doing things the usual sans would do.
- He smokes, but only does it because he thinks it cool.
- There's no backstory to this barely mentioned character.