Corvus.. And I will be using it at least 1-2 years till I didn't get him as 6* r3 or someone who can replace him in short quick fight aq/aw/ Event quest
My first rank 5 was blade and still to this day he's one of the champs I use the most. Still incredibly useful all around. One of my top questing champs and is almost always on my team for AW.
Since I only have 1 and it's my corvus absolutely. He is the one champ that I always put in my teams unless A. I can't use him (variant 4 chap 2 and beyond) or B. when I fight Rol winter soldier for fun (corvus hates high health pools)
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My 3rd was CAIW (I think), and I definitely still use him.
Sentry and Yellowjacket were in my first five.