well sumika is a typical childhood friend archetype , her comedic interaction are mainly for silly
punchline line for Takeru , and Sumika is quite friendly and sociable to Meiya and the rest ( Well extra verse and Final extra well she's quite attach to Kasumi ... as expected )
I got a really nagging feeling about the XM-3 future if this was gun*am verse i think it can be modified like ALICE system [Advanced Logistic and Inconsequence Cognizing Equipment]
http://gundam.wikia.com/wiki/ALICE or NT-D like system later on