pedrorq: InEffect, your Inquisitor 1 / Cleric 19 is definitely the most interesting way of playing Jaethal, despite that "lost" first level. :) I was wondering if you considered:
1) Harrim: Cleric 1 / Druid 19
Advantages:
* memorize buffs & heals / spontaneously cast summons (similar to Jaethal)
* extra meat shield on a pet (I picked Smilodon)
* Cleric level gives nice proficiencies - plate armor, large shield, javelin or mace (I had Harrim named in Vordakai's Tomb, and the soul eater couldn't touch him
2) Linzi: Bard 1 / Sylvan Sorc 19
Advantages:
* Sylvan Sorc 20 is, according to you, a very strong build so this is a "minor loss" of a level
* Bard level gives some interesting proficiencies, including no arcane failure when using light armor and the possibility of using crossbows
most 'interesting' way is probablty a glutton wizard. Give her profane staff from the DLC, and with her undead bonuses, rod of undead and cloak of sold souls she'd reach ok-ish DC's.
Druid doesn't do much. If you want a druid caster you wand wiz7/dru3/theurge10, which harrim can't do. Another option to play a druid is feyspeaker shifter and Val does that job better if you need her to. With dru19/cler1 he gets to be a creeping doom bot and that's about it. Worst thing about his is he has a grand total of 0 redeeming qualities. 20PB, meh stat spred, useless god with useless domains... there is nothing that can be done apart from throwing a pity party and taking him for a ride 'just cause'.
Linzy is the same as Harrim. Bad stat spread, no redeeming qualities. Worse than a merc in every way possible. You technically can make her an ok tower shield tank by late-game in the spirit of valerie, but she'd have to sacrifice head slot for the top hat from linnorm cave to wear her stuff, so she needs some other cha slot to have at least some extra spells to justify her pitiful existence. It's doable, but is pain to do and all that effort is to be disappointed in the endgame. To hell with the bloody midget. Park her in town and forget she exists. If you want a bard that isn't val there is jae and reg that both can do the job better than linzy.