These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ho Yay: Lampshaded when Ben and Reed go to face Thanos:
Oh, this is just pathetic. This laconic, heroic, tragicomic— garbage!!! Walking off to certain death with your heads held high! You might as well hold hands, because that's how homoerotic it is!
Plus, minor character "Strange Josie" (one of the other Baxter Building kids) is an out lesbian. When Sue chats with her about her relationship with Reed, Josie suggests that she try to switch teams.
Tear Jerker: Ben Grimm's confession about multiple suicide attempts.
The Woobie: If not in the present, then when he was a kid, Little Victor just needed a hug.
The Thing, even more than in the mainstream continuity; whereas mainstream Ben has long ago accepted his transformation and even embraced it, Ultimate Ben is so depressed by his transformation that he's attempted suicide. And each one fails because his body is nigh-invincible.