i guess Tsundere changed meaning...because neither are tsunderes. Karen is kinda wholesome, being nice and happy to see MC, and Remu kinda same...
Tsundere (
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, pronounced
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) is a
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term for a character development process that depicts a character with an initially harsh personality who gradually reveals a warmer, friendlier side over time. ← Source: Wikipedia
and neither of them shows any form of harsh-personality like at all...they're not even provocative or instigating with their words...