lonlonjp does guitar solo arrangements of various game/anime themes.
Spoiler for space:
(FFVII) Those Who Fight Further
(Naruto Shippuden) Blue Bird
Many others in his channel, so check it out.
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Some songs from the Dragon Quest series:
Spoiler for space:
DQ8 - Chatting
DQ8 - Heavenly Flight (symphonic version)
Piano covers: