Add default characters list for reference

ideas/README.md

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 # Ideas
 
 A list of art and story ideas. Some of these are for longform stories/comics, some are for one-shot pieces of art and commissions.
+
+For a quick list of characters and ideas, go check the [defaults](default-characters.md).

ideas/default-characters.md

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+# Default Characters
+
+This is a list of characters to remind myself which ones I like. It can be hard to think of stuff offhand or when a commission slot suddenly opens up.
+
+Also, [original characters](../characters), but that should be obvious.
+
+## Basic concepts
+
+* Skintight latex
+* Futanari
+* Transformation
+* Dollification
+* Magic-casting
+* Robotization
+* Swimsuits
+* Shiny things
+* Nipple/clit rings
+* Bodyswap, body part swapping
+
+-----
+
+## Misc. Anime / Video games
+
+* Disgaea - Etna
+* Flying Witch - Akane
+* Legend of Zelda - Midna
+* Legend of Zelda - Zelda
+* Magipoka - Liru
+* Magipoka - Pachira
+* Metroid - Samus Aran
+* Spice and Wolf - Horo
+* Teen Titans - Raven
+* Witcher - Ciri
+* Yu Gi Oh - Anzu Mazaki (Tea)
+* Yu Gi Oh - Dark Magician Girl
+
+## Dota
+
+* Crystal Maiden
+* Drow Ranger
+* Legion Commander
+* Lina
+* Luna
+* Morphling
+* Phantom Assassin
+* Templar Assassin
+* Windrunner
+
+## League of Legends
+
+* Ahri
+* Ashe
+* Diana
+* Fiora
+* Nidalee
+* Riven
+* Sona
+
+## Overwatch (Low)
+
+* D.Va
+* Mei
+* Mercy
+* Tracer
+* Widowmaker