Imo there's nothing wrong with picking a deity if you want to for RP reasons. If you see your character as a champion of good and honor, go with Mithaniel Marr. You get a lot of tools to get by manipulating whatever NPCs you need to as time goes on.
The only thing it will affect is some factions and how your illusions work. On my Tunare high elf enchanter, my dude was scowling to certain NPCs in Neriak despite dark elf illusion. And he will have to wait till 16 to do the stein of moggok quest due to Clurg being apprehensive as a dark elf. But that was totally okay knowing I was playing the flavor of character I wanted.
It is a shame that deities are seen as a trap choice for enchanter but I think many of them are pretty cool with the theme of the class.
An erudite Prexus enchanter could model themselves after one of the infamous sea creatures of legend, the Sirens.
A Brell enchanter makes sense too, given all the metals and gems that enchanters work with.
A Bertoxxulous human enchanter working for the Bloodsaber cult, charming and luring victims into the sewers to be turned into minions or sacrificed to the plague lord, how badass is that?
And so on...
Play to the flavor you want for your character, you can make up for the shortcomings later.
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