He shook her hand gladly before wheeling the chair back and to the side, gesturing to the group. "Welcome to the Xavier Institute, Wonder Woman." He was using her main title rather than her name likely due to the presence of the students. Many of them were looking outright awestruck.
Including the girl with cat eyes and tan horns coming out of her forehead. She in particular was holding a welcoming card in her clawed hands that she had obvious made herself. Another boy without seeming any pupils or irises turned his head toward her, white eyes blindly observing with quiet curiosity.
"Welcome, Wonder Woman!" many of the children repeated, an awkward staccato of the greeting which had not been rehearsed and some were uncertain if they should really be speaking to her.
"These are some of our top honor students. They are all very glad to meet you." A boy grinned and waved, hand a blur. An annoyed girl grabbed his hand and forced it down, her expression deadpan at his antics. "Please feel free to ask them any questions you may have at any time. Shall we go in?" He turned to start leading the group in.
One of the students looked curiously at Diana and dared to whisper, "Aren't you cold?" To which another student who was wearing a sleeveless shirt rolled her eyes while starting to follow. "It's not that cold." "You never get cold," the student whispered back.
Yes, they were very much children. Charles was obviously not running a military institute.