For me it would be one who actually does what is best for the mum and baby and not what is easiest for her/him.
Actually read the notes to know what the woman wants and listen to her wishes!
I had an EMCS with my first because midwife wanted me to lie flat on my back during labour (so she could leave me on monitor and leave room to attend to other women) and DD got into bad position as a result. This is despite midwife-led ante-natal class advice to the contrary!
I was not made to feel that my wishes were important at all plus being in first labour was dealing with all that entails, so went along with it. Now pregnant with #2 and will be much more vocal this time as more confident and know to listen to and trust my body.
Also giving reassurance that it will all be ok, had trainee midwife in attendance during first labour who told me if I didn't listen to her and have experimental drug I could bleed to death and nearly die like a woman she had the other day! Plus knowing how to work equipment and making sure it is working properly, I wasn't reassured when trainee midwife failed to set up monitor correctly and only found out half an hour later as no one was there to correct her. Nor when midwife failed to notice DD's heart-rate dropping with contractions (MIL did!)
Also non-judgemental important, midwife turned my chosen music off and made racist comment that it must have been my husbands choice as it was some weird foreign music (DH is black, but not foreign).
Explain why something is neccessary if it is, or why you are doing something, labour can feel out of control as it is without not knowing why you are being poked, prodded etc...
From my experience of first labour, it is painful, tiring, and scary all at the same time and to have someone who can reassure you, keep up your confidence, cheer you on is really important. I was lucky my MIL was there as she provided that support for me when midwife didn't, but not everyone has that support (DH was scared too, despite having been at several births before so couldn't reassure me, I am sure many first time fathers would be the same).
Post-labour care equally important, if a new mum asks for help she needs it, do not fob her off. Be it help with latching on, getting baby from crib (I was bed-ridden on catheter for first night so couldn't get out of bed), confidence with holding baby, be there to help.
It is easy to be snappy or short when stressed and over-worked, but for a new mum whose hormones are all over the place with a new life dependent on them they need sensitivity and a friendly face, all be it with a firm manner if needed.
Good luck with your training.