User blog comment:Neon Girl Star/Could SEGA be making Silvaze an official couple?/@comment-23764456-20140226012401

Silver the Hedgehog and Blaze the Cat had a brother/sister relationship, you can check in their respective pages for official sources.

Trough Sonic the Hedgehog 2006, Blaze looks after Silver as her young brother, she is not attracted to him or feels any desire towards him, her character profile explicitelly calls Silver her "brother".

the same way a sister wouldn't date her brother or a brother wouldn't date his sister, Silver and Blaze show absolutelly no romantic interest or desire on each other, nor in Sonic '06, neither in any other game in the franchise.

contextualizing their relationship this way, makes it really hard to see them as a potential couple.