I didn't knew Diego could hold his breath for a long time. Did I miss it in the show? Do the others have powers we 'just-show-ers' don't know about?
In the comics, Diego’s ONLY power is not needing to breathe! His knife-throwing is literally just a hobby he developed to compensate. (Which I honestly think is much more fun and more exemplary of his character.)
And I think it’s well known that Klaus casually has very powerful telekinesis in the comics and floats everywhere- I don’t know if that’s going to make an appearance in the show, or if they changed it to make Vanya’s soundwave powers seem more powerful, since in the comics Klaus can do literally almost everything Vanya did in the show.
Also! I think the show glosses over the explanation of Ben’s powers. Ben’s superpower ISN’T that he turns into a tentacle monster. RATHER, his superpower is that his body serves as an interdimensional portal. The tentacles and other monstrous things that come out of him are actually completely separate entities from another dimension that are reaching THROUGH him and more-or-less obeying his commands for some reason. (This is why, in the show, he’s shown as not having a lot of control over them- because they are NOT him. He’s just opening the door.) Feasibly, his gateway-body could be used for a lot of things. (And probably has been, in the comics.)
(Speaking of the comics, in Hotel Oblivion issue #5, Luther and Diego travel to another dimension and we actually see what is likely one of the still-living tentacle monsters that Ben channeled, completely separate from him! It was very exciting.)