Wich red to up?

Hi everyone!
I have the rings to up 1 5* hero, but I really hesitate. At the moment, my red in defense is C Marj. My red mono is Boldtusk, C Marj, Mitsuko, Gefjon and azlar.
Here are the candidates:

Yang mai
Zenobia
Lady Loki
Jf
Nemo
Santa
Reuben
Baldur
C elena
Khagan

Could fins a way to give emblems to any of them.
Which one would you up if you were me? Tanks for the help

Ps: my defense is:
1/ in double: morel, C kad, sif, Xnolphod, C Marj
2/ in reversed: C kad, morel, C Marj, Xnolphod, Odin

I´d choose Zenobia, maybe Santa if you don´t have any red armor breaker.

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That’s what i thought too, thx for the confirmation