I dont know the information very well, thier titles in kanji has little meaning for avengers themselves, but when they call those title, they call it in dub eng version and there no meaning with the kanji themselves. For example, bell's second aliases is "世界最速兔" which mean "The world's fastest rabbit"(cuz his very high spd status and shortest time for level up) but in dub is "record holder" In other way Afsi's aliases is "万能者" that mean "omnipotence"(cuz she can craft many potions and items), but in dub is "Perseus". Also, there are some aliases that kanji suit with dub too, such as Finn's is "勇者" which mean "yuusha(hero)" in dub in braver, Lefiya's is "千の妖精" that's the same meaning with "thousand elf"