Spellcasters can have pointed ears without mods (to allow elves and such).
I wouldn't classify any spell as specifically Unseelie. All of the spells have good and bad applications. It's how you use them that counts, reputation wise.
For example:
- Setting a sim on fire with Inferniate - Bad
- Lighting a fireplace with Inferniate - Neutral (Good on a cold day, Bad on a hot day)
- Stealing items for personal gain with Burgliate - Bad
- Retrieve stolen things with Burgliate - Neutral
- Prevent Evil use of Weather Machine by removing it with Burgliate - Good
- Breaking things for fun with ZipZap - Bad
- Breaking things with ZipZap so a sim can train Handiness skill - Neutral
- Breaking things with ZipZap so they can't be used for Evil deeds - Good