Gaim deserves the apple to be his final form! Ryugen with the dragon fruit.

What of Baron, Zangetsu & Griton? What final forms suit them?

Bananas Foster, Grape Parfait and Coconut Cream Pie!:lolol

Yes Wonder, yes :lol

Seeing episode one, I think I have some. At some point Kouta will eat one of the Lock Seed Fruits in the Other World, and that's how he unlocked his Ultimate Upgrade in the show.
The First Scene with Baron charging at Gaim will come to pass towards the end of the series.

A pear?

... Baloney.

What if there were two brothers who both used pear lock seeds to become identical riders? A pair of pears!

I think SPLIT LIP would have a coronary if that happened.

So random thought... What if he doesn't use a fruit for his final form, but the actual tree? The lock, whilst still functioning like the lock seeds (with the flap/flippy down part) would be larger and have roots stretching across the top and bottom of the belt. (Kinda like the Keitaros phone)

Being the tree of life and what not it'd also work like the cosmic switch, giving access to all the possible arms changes. It'd even power up his bike ala Ryuki survive.

I had the same idea!

Tangerine.