Reading this is hell I'd suggest a separate post for the diffrent category of the suggestion.
I'm going to make each category a separate post so I can repost them if you do make separate posts.
2999-b is fine, I'm always up for more respawning types. The ability is useful but could be a way to trap its fellow scp in rather than helping them, and its a bitch to get a level 5 door open as we have no respawn class that starts with a level 5. +1
093-1 I've always liked this scp lore wise but it's pretty huge. I'd suggest the 093-2 do a bit more since 093 is so slow. +1
1504 probably the most intresting one I see in this list for hostile scp. I'd suggest a respawn system similar to scp 076, but with a 1-2 min delay +1
016 is good with the rage mode, maybe make the charge only stop when hitting a wall and have a 1 second stunned phase to balance it. +1
4725 seems enjoyable, perhaps give it a bit more hp. +1
527 is a good meme scp. It can serve the opposite role as scp 035 trying to get scp out. +1
1507 maybe make it a respawn or special round as it's a lot of scp to spawn at once and would take too many scp slots. Other than that it seems fine. +1
020 fun to have an scp against mtf that spawns with them, but to prevent all the mtf being instantly infected I'd suggest a 15-30 second second infections +1
Any not listed I'm either neutral on or already commented on the original post