It'd help to see your full roster, but I would probably go with either Bellower or Kael.

On the one side, Bellower will help you farm campaign more effectively, and can be used quite a bit into endgame as a dedicated stunner. 

On the other side, Kael will help you with clan boss early on, which might let you advance faster - however, will probably be replaced by Frozen Banshee if you get any ally-attack or counter-attack champs.

tl;dr I'd probably go with Bellower.

If after 1 month of playing you are working on your first 5* champion, you surely take your time and hopefully enjoy the game. 

You should take Kael in my opinion. krama is right that Bellower can help you out with a stun set but I have the feeling that you are not getting one soon. 

Concentrate on Kael, bring him to up to a level and gear state in which he can solo farm 12-3 brutal and the follwing leveling will become much easier.

It  would  be  best  to  have  someone  who  can  farm  12-6  efficiently.  Bellower  and  Kael  can  both  do  this.

However,  Bellower  needs  much  better  gear,  while  Kael  can  do  it  with  less  quality  of  gear.  He  is  also  more  usable  all-around,  with  Poisons  and  a  Nuke  for  Arena.

Thank you all.  I appreciate your advice.  I've been focusing getting Aleksandr to asended to level five along with Urogrim.   I did that and now want to focus my other epic, Jizoh and one of the rare's I asked about. I should have given that information from the beginig.  Sorry.

Can you post your roster? 

Any of those three champions you posted are going to be a better option than Jizoh. 

Don't spend any resources on Jizoh.  Also, don't spread yourself too thin.  You ideally want to focus on getting a single champion to 6 star instead of having multiple champions at 5 star.  I would take Kael to 6 star if I were you.  He can work in all formats, including campaign, arena, dungeons (especially dragon) and clan boss

Once you have Kael at 6 star then figure out which champion to increase next

Thanks.