Yes. YESSSS. I completely agree. I never liked their relationship, but when I replayed FF6 as an adult, their relationship was so forced and both were made lesser characters for it, imo. Locke treated her like shit at times and Celes was so.....dependent on him. I originally thought I didn't like them as a kid because it felt like Locke/Terra was going to be a Thing and I got attached, but no, it's just kind of a shitty pairing. And yeah, Locke's thing with Rachel was always super creepy.
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