Unpopular Opinion: Lann is the best tank in the game. (you're so awesome Lann)
I admit that I have the fervor of a true believer on this issue because I was late to discover that Lann is potentially the best tank in the game.
And he's so much better at tanking than a certain helpful companion
Why?
Lann is a mongrel and mongrels get a unique natural armor bonus that stacks with other natural armor bonuses.
He has a monster stat spread - wisdom, dexterity, strength. Lann's starting stats are pretty awesome.
Lann is a monk and can go through the full crane sequence. Take a second level of monk, get the free dodge feat and you're off.
One pip to dex, one pip to wisdom and you out tank our favorite murder mistress
================
Potential dips / class switching
Want to make a Lann a helpful Shaman? You can do that and you can even choose a better shaman class than spirit hunter and start with a higher wisdom score.
Want to make him a Sossiel substitute that tanks? You do that as well.
Make him a empyreal sorcerer and you've got shield and mage armor which make him a touch AC monster capable of tanking the shadows in act 1
Grab a headband, make him a crossblooded sorcerer and you can take him through the dragon disciple sequence.
You could even give him a stigmatized witch dip and switch the dragon disciple over to the witch spellbook. Besides, a lizard familiar just makes roleplay sense for Lann, right? Right?
TL;DR - Lann is so awesome