Mysterious, yet all the more alluring to Sailormoon - Tuxedo Kamen. At the same time, he feels an intense want to protect her, and shortly thereafter, and attraction to her beauty, personality, and strength. Just like in his civilian form, I feel that Tuxedo Kamen is very unsure of his power and ability to protect those that he cares for.
Inside he tortures himself because he does not possess the same powers that the otyher senshi have to protect their beloved princess. Regardless, he is committed to her anyway. He is always there to put what power he has to the limit; he is always there to remind and reassure Sailormoon of her own abilities when she needs to hear it the most.
He gains an incantation attack eventually; "Tuxedo La Smoking Bomber". He can also combine powers with Sailorchibimoon to perform "Pink Sugar Tuxedo Attack!" His true power of the Golden Crystalis also revealed in the Dream Arc.