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First R4 suggestion please.

Red Skull or Count Nefaria both duped sig 60. General use. I like them both(my top 2 considerations)
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But if you are searching for bg u can upgrade r skull also.@MASTERPATRICK
For anything else - Count
Red Skull was in consideration when I had to r4 my first champion, which was a Tech rank-up. He's definitely a worthy candidate and if I get a Tech gem in the future, I'll probably pump it into him with no question. But aside from on defense, I don't think he's a better champion than Nefaria.
I do have a 7* Count, but I've never felt the need to learn him as my other science champs seem to handle every situation needed this far.