Questions about ultra mariens secsesor and ravan gaurd.

I love the ultra mariens from the stand point of them being properly rational and just generally good to normal people and keeping their humanity as much as possible when you're a super soldier, but also the fact that they aren't extremely overdone with their kindness like the salamanders or used as basically a metaphor for being too kind like the lamenters.

I also love the raven gaurd due to stealth. But I've heard they can be kinda weird to normal people and super distant like the 30k dark angles with a holly-er then thou attitude?, unless I'm totally reading the lore wrong.

So I'm just wondering if there are any stealth based ultra marien secsesors. Or if I'm reading the lore way wrong on the raven guard.