Need a last character I have this character who is a triplet but I am having a hard time figuring out what the last character of her name should be.
So far her other triplet sisters are named 任子婷 and 任子婧, and I wanted her last character to have a similar meaning to their's. 
(Some of her personality traits, if it helps&gt;&gt;She's smart, respectful and is very leader like.)
congratulation 
“婷” &amp; “婧” are both 女部英韻, so, the third one, i would suggest:
婛 (u+5a5b)
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=婛
娙 (u+5a19)
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=娙
婈 (u+5a48)
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=婈
姈 (u+59c8)
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=姈
娉 (u+5a09)
http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=娉
have fun :)