From what I heard if you ever try to touch her romance will not progress as she is disgusted by a touch from a monkey.
As for Ulfar, I enjoyed listening to his voice lines so his quest was not bad. What was really bad is Argenta's last quest.
Regarding the romance I didn't touch her.... I even went to check guides in the late chapters as I was wondering why it stopped with the scenes.
Still don't know what I missed or what I did wrong, but apparently it was bugged, fixed, bugged several times so who knows if it is my fault.
Ulfar quest is stupid because you find the marines dead, nobody cares how they died, why, and to find the perpretators, or at least understand what happened, which is not what you would expect, "oh they dead, lets give them a funeral". Also he is theorically pretty dogmatic, and after the recruit he immediatly gives you a "god-emperor is just a man *tips fedora* talk". On top of that I generally find the viking stuff pretty cringe.
Argenta quest was just filler but at least made sense with the writing?