summon armor_stand ~ ~ ~ {\
            NoGravity:1b,\
            Invulnerable:1b,\
            Marker:1b,\
            Invisible:1b,\
            Tags:["katter.tenku.asset","katter.tenku.rider.base"]\
        }

ride @n[type=armor_stand,tag=katter.tenku.rider.base,distance=..1] mount @s