Satya and Mithya are, in normal parlance, taken to be antonyms or opposites. the sense is that of reality and unreality/fable/fiction.
However, if you delve into Vedanta, there is a very interesting take on these two words: Satya means unadulterated truth and Mithya is dependent truth i.e. truth depending on the absolute truth for its very existence.
This gives a very heartening meaning to myths. Instead of getting embroiled in the 'myth-or-history' debate, I prefer to look upon myths as 'adulterated reality' to coin a phrase. In other words, a myth is a colourful quilt woven out of the cloth of what actually happened. It has all the embellishments, but the seed of truth in it is derived from what actually happened.
Indian mythology is replete with a rich tapestry of characters, each more varied and wonderful than the other.
Let us begin our wonderful journey across the sea of mithya, a journey so wonderful that it needs no destination!
