series crossover power matches in general don't work that way since it requires a give and take factor in the magic/power designs of both universes.
It wasn't Eva bragging anyways, he's referring to the fact chamo mentioned when researching rakan that Rakan matched one of the ancient dragon lords in combat which are suppose to be on par with the shinsou vampire classes that full power Eva falls under. Anyways as per my arguement above I could see eva falling under a DAA if done right simply cause half the DAA fall under 1 really broken skill, if you can get around that skill/Reality Marble/ability most of them aren't that hard to take out (the church has sealed/defeated almost half of the 27), and usually killing your the DAA/DA that made you raises you to there rank (which if following the negima canon Eva was able to kill the one who turned her if memory serves me right).
if anything i could see her replacing
14: Van-Fem
Puppet Master. It realizes the 7 gigantic golems, the "Castle" Also known as "Demon Castle Van-Fem". He has a status in the human society, and an ecologist. His 5th demonic castle, Motley was destroyed by White Knight Blood's ghost ship/Parade during a war between them, and since then, he hates Altrouge's group.
when thinking about it although i would like biri biri to be in the class 3-A actually having one of the 'sisters' join the class would actually be a lot more fitting considering how they were scattered around the world.
Eve would be fun but it's been to long since i read black cat and she wasn't that rememberable so much so that golden darkness sticks out in my mind more.
Saginomiya Isumi (hayate the combat butler) - cause i could so picture her being related to konoka.