You can use kind, friendly, or a word that describes exactly how they are nice, such as generous, forgiving, or whatever word(s) apply.
Instead of using the word challenging you can use the word gifted, special, special gifted.
or
Will, when, why, it, can
Myself
I have a stomach ache.
mixture
are
used to be
is, it, in the past.
no "It" is not used instead of he and she...
Answer.