Worst build?

Well I did give my -Def Innes LnD and Ignis (for the memes of it). Worse would be a LND (-Res) Virion running Glacies, Ploys(C/S), and seal Res, though.

Also I once found a 4* Hector in the training tower sporting Desperation.

Desperation in low speed units. I saw one of those in arena in a Bartre, I suppose that Brash Assault seal fell off him.

Tactic skills in bladetomes are awesome too. Or Wrathfull staff on low attack healers like Lucius which deal damage by pain+

I do that for fun.

pretty much my entire barracks xd jk

This shitty (but really scary) build